Where can I get browser use data broken down by country?

I've seen plenty of sites that provide data on which browsers and versions of those browsers are most popular on the web today, but I'm curious about whether certain countries are more enriched in a specific browser than others. I am on a project now, and the PM seems to think that IE6 is the most prevalent platform in the parts of corporate India that are likely to use this site. I have no reason to really doubt that, but I was mostly just curious if there are data available to back that up. Do different countries really have different browser use tendencies?

EDIT: Thanks to Dan F. for the great link. It shows that IE6 is by far the main browser in India. Can someone enlighten me as to why it's so tremendously different than the U.S. IE6/7 ratio?