I found a link to these charts over on io9, and man. They might take a little while to load, but they are ridiculously detailed.
Some people over at The National Post went ahead and charted every single zombie kill that’s ever happened on this show. You can see which character has killed the most zombies, how many zombies each character has killed per season, the proportion of male to female zombie kills, etc.
It’s kind of awesome. Some people, clearly, are far more dedicated fans than I am.