So people are still curious.
Somebody came searching for how many third trimester abortions are performed in the US. The Centers for Disease Control are very careful not to collect that information. They only repot that in 2004 (the last year for which they've released data) there were 8,365 reported abortions at 22 weeks and greater. This is post-viability (since a 22 week baby has a survival chance of up to 10%), but two weeks short of the third trimester.
Let me gather all the stuff in one place: