Internet demographics company Experian Hitwise released its search engine stats report this week, showing that Google lost a bit of ground to Yahoo. The stats in the first table below compare US searches for June and July.

The second graph shows success rates with the big search engines, and shows that Yahoo! Search and Bing achieved the highest success rates in July 2011. Success rates measure if searches executed resulted in a visit to a Website.

Once again, this data is pointing to the fact that we should all be working a bit harder on optimizing for Yahoo / Bing powered searches!