Your Wiki list is based on old data. It looks like they used data from 2014.
It is difficult to find more current ratings. They tend to release them by station, since the ratings impact local rates.
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from http://www.talkers.com
Friday, August 5, 2016
Cumulus Media has a 4.1% revenue decrease for the 2nd quarter.
Westwood One is down 13.8% for the 2nd quarter.
From talkers.com:
Rush Limbaugh and Premiere Networks Reach Agreement on Extension. There was little doubt from most industry observers that talk radio superstar Rush Limbaugh and iHeartMedia’s Premiere Networks 
would come to terms on an agreement to continue syndicating Limbaugh’s show. Not surprisingly, today’s announcement from Premiere did not mention the terms of this new deal, but simply called it a “long-term, multi-platform agreement.” Eight years ago, Limbaugh and Premiere announced a partnership agreement that was widely reported to have been worth $400 million. The conventional wisdom is that changes in the radio industry and the backlash from the infamous “Sandra Fluke incident” have negatively affected Limbaugh’s ability to earn the type of ad dollars that would justify that kind of money this time around. At the top of today’s program, however, Limbaugh told his listeners that the deal is for four years and he gets no regular salary but, presumably, a percentage of sales. He said, “I have to make my numbers.” In the press release,Premiere stated, “Ad revenue for ‘The Rush Limbaugh Show’ has also increased by 20% over last year, and the show continues to be the number one program in talk radio.” Limbaugh celebrated his 28th anniversary in national syndication on Monday. He said in the prepared statement, “After 28 fulfilling years, I seriously considered moving on to something else, but Rich [Bressler] and Bob [Pittman] were very persuasive. I’m thrilled to be continuing. And I really want to be on the air if the Russians find Hillary’s emails.”
Last year, here in the Boston market, Rush was kicked off 50kw WRKO and wound up at 5kw WKOX, which is having trouble filling its ad minutes (actually, I don't think they are even bothering). They run the same set of PSAs and promos over and over to fill up the breaks.
From Nielsen:
|
|
|
|
|
| WBZ-AM |
News Talk Information |
5.6 |
5.0 |
5.2 |
| WBUR-FM |
News Talk Information |
3.4 |
3.6 |
4.0 |
| WGBH-FM |
News Talk Information |
2.9 |
2.6 |
3.4 |
| WRKO-AM |
News Talk Information |
2.0 |
2.1 |
2.0 |
| WKOX-AM |
News Talk Information |
0.2 |
0.2 |
0.1 |
| WXKS-AM |
News Talk Information |
0.1 |
* |
* |
WBZ is straight news during the day, talk at night. WBUR and WGBH are the local NPR outlets. WXKS is business talk (Bloomberg). WMEX is also talk, but not listed for some reason.
WRKO, WKOX, and WMEX all run a 12-3 talk show, Jeff Kuhner, Rush Limbaugh, and Sandy Shack, respectively