http://www.nua.ie/surveys/index.cgi?f=VS&art_id=905357752&rel=true

AOL still the world’s favourite ISP
Mar 14 2002: According to WebSideStory’s StatMarket, about 14 percent of the world’s Internet users use AOL as their ISP. 

This is down 2 percent since early 1999. AOL’s nearest competitor is Road Runner, with a global usage share of 2.76 percent. Road Runner is not a competitor in the strictest sense, however, as it is owned by AOL Time Warner. 

UUNet is in third place with 2.18 percent global market share, followed by Sympatico with 1.04 percent, Mindspring with 0.79 percent, and T-Online with 0.61 percent.