WoWProgress is now tracking amount of pulls on different bosses for all guilds and characters!
1. Go to guild page.
2. Progression table contains new column: Pulls.
3. Click "+show".

It will show raid setup including:
- characters that killed the boss
- replaced characters that didn't participated in the first kill
- amount of pulls for each character!

Update:
As the data has been removed from the API by Blizzard, we had to disable the feature now.