1 California 5.2% 1,338,164
2 Florida 4.6% 609,219
3 New York 4.2% 592,337
4 Texas 3.6% 579,968
5 Illinois 3.8% 345,395
6 Ohio 4.0% 335,110
7 Pennsylvania 3.5% 323,454
8 Georgia 4.3% 278,943
9 Massachusetts 5.7% 269,074
10 Washington 5.7% 266,983
Some states, like Texas, rank high biggest because their general population is high.
This data and more comes from the U.S. Census Bureau's American Community Survey. Link below:
IIRC, the 10% figure came From Alfred Kinsey (U of Indiana) out of surveys that oversampled prison populations. Kinsey had a very clear personal agenda. His numbers have been long discredited by legitimate social scientists.
The likely figure is in the 2% range.