The frequency of touchbacks has nearly doubled from 2011 to 2012. The distribution of starting field position is a bit more narrow this year as well. The spikes at the 40-yard line in the 2011 data and the 35-yard line in the 2012 data are due to where the ball has been placed following a kickoff out of bounds in each season. Touchdown returns have been consistent from 2011 to 2012, occurring on 0.8 percent of kickoffs in each season.
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