Year Percent 2005-01-01 88.8 2006-01-01 82.6 2007-01-01 96.8 2008-01-01 1.9 2009-01-01 1.8 2010-01-01 188.1 2011-01-01 162.5 2012-01-01 136.6 2013-01-01 135.2 2014-01-01 99.3 2015-01-01 107.8