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Never heard that stat but below is most of what i found as regards the West, while as the world population is increasing so should numbers of church members to keep up, but i do not think they are. Sadly, Mormons show the greatest growth but they count as member everyone baptized that is still living unless excommunicated.

The Catholic population of the United States had fallen by nearly 400,000 in 2007, and suffered a slight membership loss in 2009 but increased 1.49 percent in 2010. [U.S. population growth rate in 2008 was 0.9 percent, and 0.57 percent in 2011.]. From 2007 to 2008 Roman Catholics grew from 17.33 percent of the global population to 17.4 percent in 2008. http://www.catholicculture.org/news/headlines/index.cfm?storyid=5753 http://www.ncccusa.org/news/100204yearbook2010.html; http://www.ncccusa.org/news/110210yearbook2011.html
2002 Statistics compiled by the U.S. bishops' Secretariat for Hispanic Affairs reported that 71 percent of the U.S. Catholic population growth since 1960 was due to Hispanics. The statistics are taken from U.S. Census reports and recent surveys of Hispanics. http://findarticles.com/p/articles/mi_m1141/is_15_36/ai_59607715/pg_3/
In 2008, 25:1% of respondents self-identified themselves as Catholic (versus 26.2 in 1990), with 50.9 belonging to Other Christian groups (from 60% in 1990). http://www.americanreligionsurvey-aris.org/reports/ARIS_Report_2008.pdf
24% of current “Nones” (not identifying with any religion) and 35% of 1st generation or "new" Nones) identified themselves being Catholic at age 12, 11% identified themselves as "Christian," 7% as Baptist, and 3% as Protestant. 2008 American Religious Identification Survey (ARIS); http://commons.trincoll.edu/aris/files/2011/08/ARIS_Report_2008.pdf http://commons.trincoll.edu/aris/files/2011/08/NONES_08.pdf
According to the American Bishops' count (as reported in WP) in their Official Catholic Directory 2010, which primarily rests on the parish assessment tax which pastors evaluate yearly according to the number of registered members and contributors, Catholics in the United States represented 22% of the US population.
2010 reports show the Church of God (Cleveland, Tenn.) - ranked 24^th largest - increased 1.76 percent, and the Assemblies of God (9^th) grew 1.27 percent. The “Latter-day Saints” [cult] (ranked 4^th largest) grew 1.71 percent, the Jehovah's Witnesses [cult] (23^rd ) said they were up 2 percent http://www.ncccusa.org/news/100204yearbook2010.html
The Presbyterian Church (USA) shrank 3.3 percent Southern Baptist Convention, the largest denomination after Catholics, lost 0.24 percent of its membership and now stands at 16.2 million. It also declined in membership in the year prior. http://www.catholicnewsagency.com/news/catholic_church_shows_robust_growth_in_u.s._membership_new_report_says/
In numbers (not percentage), Catholicism, which lists 68.1 million in the US, has experienced “the greatest net loss” of any major religious group. members. The 'had it' Catholics,” National Catholic Reporter ,Oct. 11, 2001, based on reports from the 2008 Pew Forum on Religion & Public Life survey and the National Council of Churches’ 2010 Yearbook of American and Canadian Churches.
68% of those raised Roman Catholic still are Catholic (comparable with or better than the retention rates of other religious groups). 15% are now Protestant (9% evangelical); 14% are unaffiliated. Pew forum, Faith in Flux (April 27, 2009) http://pewforum.org/uploadedfiles/Topics/Religious_Affiliation/fullreport.pdf
44 percent of Americans have switched religious affiliations since childhood, mostly mainline Protestants. 7% who were raised Protestant are now unaffiliated; 15% now belong to a different Protestant faith. ^
80% of adults who were raised Protestant are still Protestant. ^
51% of Protestants from a different Protestant denomination cite a lack of spiritual fulfillment as a reason for leaving their childhood faith. 85% say they joined their current denominational faith because they enjoy the services and style of worship Only 15% left say they left because they stopped believing in its teachings. ^
Those who have left Catholicism outnumber those who have joined the Catholic Church by nearly a four-to-one margin. 10.1% have left the Catholic Church after having been raised Catholic, while only 2.6% of adults have become Catholic after having been raised in a different faith.
4% of Americans raised Catholic are now unaffiliated; 5% are now Protestant. ^
Over 75% of those who left Catholicism attended Mass at least once a week as children, versus 86% having done so who remain Catholics today.^
Regarding reasons for leaving Catholicism, less than 30% of former Catholics agreed that the clergy sexual abuse scandal played a role in their departure. ^
71% of Protestants converts from Catholicism said that their spiritual needs were not being met in Catholicism, with 78% of Evangelical Protestants concurring, versus 43% of those now unaffiliated. ^
50% of all Protestants converts from Catholicism said they stooped believing in Catholicism's teachings overall. Only 23% (20% now evangelical) were unhappy about Catholicism's teachings on abortion/homosexuality (versus 46% of those now unaffiliated); 23% also expressed disagreement with teaching on divorce/remarriage; 16% (12% now evangelical) were dissatisfied with teachings on birth control, 70% said they found a religion the liked more in Protestantism.
55% of evangelical converts from Catholicism cited dissatisfaction with Catholic teachings about the Bible was a reason for leaving Catholicism, with 46% saying the Catholic Church did not view the Bible literally enough.
81% of all Protestant converts from Catholicism said they enjoyed the service and worship of Protestant faith as a reason for joining a Protestant denomination, with 62% of all Protestants and 74% Evangelicals also saying that they felt God's call to do so. ^
42% of those now unaffiliated stated they do not believe in God, or most religious teaching. ^
54% of “millennial generation” Catholics (born in 1982 or later) are Hispanics, while 39% are non-Hispanic whites. On the other hand, 76% of “pre-Vatican II generation” Catholics (born 1943 or earlier) are non-Hispanic whites, while 15% are Hispanics. Center for Applied Research in the Apostolate (CARA) at Georgetown University, September, 2010 . http://www.osv.com/tabid/7621/itemid/6850/Openers-More-evidence-of-the-browning-of-US-Cat.aspx
68% of all Latinos in the U.S. identify as Catholics. Changing Faiths: Latinos and the Transformation of American Religion http://pewforum.org/Changing-Faiths-Latinos-and-the-Transformation-of-American-Religion.aspx Baylor Institute for Studies of Religion - American Piety in the 21 Century – September 2006 . http://www.baylor.edu/content/services/document.php/33304.pdf
Among Catholics under the age of 30, 47% are white, and 45% are Latino. In contrast, among Catholics over the age of 65, 82% are white (Pew Forum 2007, reported in http://publicreligion.org/site/wp-content/uploads/2011/06/Catholics-and-LGBT-Issues-Survey-Report.pdf)
Latinos comprised 32 percent of all U.S. Catholics in 2008, versus to 20 percent in 1990. However, Catholic identification has slipped from 66 percent in 1990 to 60 percent in 2008. There has also been a significant rise in the number of Latinos who do not adhere to a religion. The longer a Latino has lived in the United States, the less likely he or she is to be Catholic. Study of Secularism in Society and Culture at Trinity College, http://theamericano.com/2010/03/18/new-report-on-u-s-latino-religious-identification/
18% of all Latinos say they have either converted from one religion to another or to no religion at all. http://pewhispanic.org/files/reports/75.4.pdf
1,000 Mexicans left the Catholic Church every day between 2000 and 2010, a decline that has continued uninterrupted over the past 60 years, from 98.21 of the population to 83.9 percent today. Latin American Herald Tribune, March 10, 2011, based upon census data and study by sociologist and historian Roberto Blancarte of Colegio de Mexico and the National Autonomous University of Mexico
The percentage of of Protestants and Evangelicals rose from 1.28% in 1950 to close to 8% of the total population in 2010, (excluding so-called Jehovah’s Witnesses or Mormons). 5.2 million say they profess no religion. ^
This decline is seen as extending across the region (Catholics represent between 55% to 73% in Central America, 70% in Brazil, 50% in Cuba and Uruguay).^
Almost 20% of all Latino American Catholics have left the Roman Catholicism, with 23 percent of second-generation Latino Americans doing so. http://www.baylor.edu/content/services/document.php/33304.pdf
54% of Hispanic Catholics describe themselves as charismatic Christians. http://pewhispanic.org/reports/report.php?ReportID=75
51% of Hispanic Evangelicals are converts, and 43% are former Catholics. 82% of Hispanics cite the desire for a more direct, personal experience with God as the main reason for adopting a new faith. Among those who have become evangelicals, 90% say it was a spiritual search for a more direct, personal experience with God was the main reason that drove their conversion. Negative views of Catholicism do not appear to be a major reason for their conversion. ^
A study which broke down Mainline Protestants, Evangelical Protestants, and non-Hispanic Catholics into the three subgroups of traditionalists, centrists, and modernists, found that 5.3 percent of the respondents qualified as traditionalist Catholic, 5.4 percent as centrist Catholics, and 4.9 percent of respondents are modernist Catholics. The Henry Institute, A Pre-Election Analysis http://www.catholicnewsagency.com/news/survey_finds_some_catholics_looking_for_a_political_home
Latinos Catholics constituted 6.8 percent of the survey respondents. ^
About 68 percent of traditionalist Catholics opposed gays and lesbian marriage, versus 50% of centrist Catholics and 65 percent of modernist Catholics. ^
Traditionalist Catholics disagreed that “abortion should be legal and solely up to the woman to decide” 71 to 21 percent, centrist Catholics agreed 54 to 40 percent, and modernist Catholics agreed 80-16 percent. ^
Catholic Latinos, overwhelmingly identify as Democratic, 57 percent to 15 percent. Religion and the 2008 Election: ^
99% of Protestant pastors who hold to very conservative theology strongly disagree that homosexual marriage should be legal, with 98% also describing themselves as pro-life, and of such 98 percent strongly agree with the statement "Our church considers Scripture to be the authority for our church and our lives." Among pastors who do not strongly disagree that gay marriage should be legal, 71 percent said they agreed with the above affirmation, as well as 65% of pro-choice pastors (three-fourths of all Protestant pastors surveyed said they are pro-life). LifeWay Research; http://www.lifeway.com/ArticleView?storeId=10054&catalogId=10001&langId=-1&article=LifeWay-Research-protestant-pastors-share-views-on-gay-marriage-abortion
Evangelical Protestants are the most politically conservative Christian tradition. Within each tradition, those with literal views of the Bible are more politically conservative than is their tradition overall. Catholics that are Biblical literalists (11.8%) hold more conservative political views than the Catholic population in general does. The Biblical literalist Catholic is as politically conservative as the Biblical literalist who is Evangelical (47.8%) or Mainline Protestant. (11.2%) American Piety in the 21st Century, Baylor Institute for Studies of Religion http://www.baylor.edu/content/services/document.php/33304.pdf