There are a lot of reason. In addition to those cited by PennyPincher, it can be a change in licensing officer (lots of chief just don't get involved in licensing), it can be a change in policy, and sometimes it's just better information. One thing that happened this year is that we got actual data instead of relying upon anecdotal information. Much of this information was dated and unreliable, often suffering from the 'echo-chamber' effect. I predict that the trend will continue to improve and that licensing data for 2014 will show even fewer restricted license issued than in previous years.
It's no accident. Thanks Comm2A!