Seems to me that the chart indicates a drop-off in resets between the middle of 08 to the middle of 09.
What I find interesting is how quickly we approach 100% reset on arms, such that by 2010 almost all have reset. This means that very few people took out the 10 year ARM, most took out the far more volatile versions. This rests on the assumption that usage of ARMs really only ramped up in the last 5 years.