searchengineland.com/google-st ...

pointing to
comscore.com/Press_Events/Pres ...

From the Market Overview study:
"....
Google Sites attracted significantly more searches than any other engine with 76.7 billion searches conducted, or 67.5 percent market share. Yahoo! Sites ranked second worldwide with 8.9 billion searches (7.8 percent share), followed closely by Chinese search engine Baidu with 8 billion searches (7.0 percent share).
...."