Year Percent 2000-01-01 0.0030820000000000 2001-01-01 1.8220299999999998 2002-01-01 1.0402900000000000 2003-01-01 1.2528000000000000 2004-01-01 0.9186440000000000 2005-01-01 0.6860560000000000 2006-01-01 1.1856100000000000 2007-01-01 1.2309400000000000 2008-01-01 1.2998500000000000 2009-01-01 2.0322600000000000 2010-01-01 1.5694000000000000 2011-01-01 2.5901600000000000 2012-01-01 2.9145500000000000 2013-01-01 3.6212000000000000 2014-01-01 4.4667800000000000 2015-01-01 5.5162700000000000 2016-01-01 4.2330300000000000