Years Available: 2007-2011, 2008-2012, 2009-2013, 2010-2014, 2011-2015, 2012-2016, 2013-2017, 2014-2018
Permanent Link: http://data.sagepub.com/sagestats/12185
General Notes: A # symbol indicates that the data is not available due to a small sampling size. A - indicates that the data could not be calculated or displayed due to little to no samples and ! signifies that the data fell within the low or high end of the distribution.