Year Percent 2000-01-01 0.0548970000000000 2001-01-01 0.5468130000000000 2002-01-01 1.0432200000000000 2003-01-01 0.9320700000000001 2004-01-01 0.8400139999999999 2005-01-01 0.8535670000000000 2006-01-01 0.8276899999999999 2007-01-01 0.7672810000000000 2008-01-01 0.8588440000000000 2009-01-01 9.6473900000000000 2010-01-01 19.2458000000000000 2011-01-01 21.1416000000000000 2012-01-01 23.3385000000000000 2013-01-01 25.1765000000000000 2014-01-01 26.7101000000000000 2015-01-01 27.7359000000000000 2016-01-01 29.5642000000000000