Interesting piece at NYRB (behind their paywall, however); an excerpt:

In 1985, after the Eighth Amendment [banning abortion] had passed, 3,888 Irish women were recorded as having abortions in Britain. By 1991 the number was 4,154; by 2001 it was 6,673. The numbers began to diminish somewhat thereafter, but only because Irish women were finding ways to procure abortion pills without leaving the country. If the purpose of abortion bans is to actually reduce the rate at which women terminate pregnancies, the Irish experience shows how utterly ineffectual they are. Some poor, vulnerable, or very young women and girls can be forced to carry babies they do not want, but a policy that depends for its success on female impoverishment and powerlessness is not easy to sustain in an open society.