Looks like around 45,000 hit by cars yearly in Wisconsin. Check out this site.

http://dnr.wi.gov/org/land/wildlife/...er/cardeer.htm

here is a part of the article.

Deer-Vehicle crashes continue to be a major concern for Wisconsin motorists. Annually, approximately 45,000 deer are salvaged with permits or removed from roadways by DNR contractors. The majority of deer-vehicle collisions occur during the months of October and November when deer are most active during the breeding phase. Many collisions also occur during May and June during spring fawning, when yearling deer are seeking out new home ranges.