Year Percent 2005-01-01 9.7980800000000000 2006-01-01 9.8646700000000000 2007-01-01 8.2146500000000000 2008-01-01 10.3925000000000000 2009-01-01 11.0339000000000000 2010-01-01 5.5906100000000000 2011-01-01 6.4495100000000000 2012-01-01 5.8936199999999990 2013-01-01 6.1917800000000005 2014-01-01 5.2614500000000000 2015-01-01 5.0038900000000000 2016-01-01 4.9428199999999990