Year Percent 2007-01-01 19.9637 2008-01-01 11.4148 2009-01-01 14.3917 2010-01-01 14.3917 2011-01-01 14.3917 2012-01-01 14.3917 2013-01-01 14.3917 2014-01-01 25.5814 2015-01-01 23.7761 2016-01-01 30.5365