Joel Wing tracks them:
Since 2009 the average number of deaths has hit a plateau. In 2009, there was an average of 9.4 deaths per day, compared to 20.4 the year before, and 65.2 per day in 2007. In 2010, the average death count dropped to 8.8 per day. There have been an average of 7.8 deaths since the beginning of 2011.
Wing also finds that violence in Iraq is now more political than sectarian.
The Dish 