Year Percent 2006-01-01 0.0000000000000000 2007-01-01 -3.3879000000000000 2008-01-01 -1.1855799999999999 2009-01-01 1.5281900000000000 2010-01-01 0.8744920000000000 2011-01-01 0.4039550000000000 2012-01-01 0.9831180000000000 2013-01-01 1.7655700000000000 2014-01-01 0.5696289999999999 2015-01-01 0.8162729999999999 2016-01-01 0.8174739999999999