Year Percent 2006-01-01 1.7412900000000002 2007-01-01 1.4672700000000000 2008-01-01 1.5013400000000000 2009-01-01 2.6983000000000000 2010-01-01 2.5869200000000000 2011-01-01 2.1123900000000000 2012-01-01 1.5083400000000000 2013-01-01 1.1775000000000000 2014-01-01 0.0821910000000000 2015-01-01 0.1486070000000000