Only google can do this. Although, it would be great to have more information about who clicks our ads.
It will show you visitors Ip and visitors exit link, if the exit link was a click on the ad it will show which ad the visitor clicked
I'm not sure what you mean by "exact stats". The only one who have know exactly what click you get paid for is Google. AdLogger, like any other script you put on your site will tell you who clicked on the ad box to leave your site. Whether or not these click actually get you money, on Google knows.