You can see Browser-share as opposed to Browser-version share if you go to the statcounter page linked above. Webkit is around 6% and Chrome is 27% making WebKit ~33% and rising. All versions of IE are ~38.5 and falling. Firefox is ~25% and falling really slowly. Opera is <2% and rising really, really slowly.

Plenty of browsers missing of that chart. I assume they have just selected the top 3 to keep it simple.