Year Percent 2001-01-01 0.9001600000000001 2002-01-01 3.5525400000000000 2003-01-01 1.6787400000000001 2004-01-01 1.5103900000000000 2005-01-01 1.0726500000000000 2006-01-01 1.9637600000000000 2007-01-01 2.3448599999999997 2008-01-01 5.6413800000000010 2009-01-01 5.3520400000000010 2010-01-01 6.3704900000000000 2011-01-01 7.4327300000000000 2012-01-01 7.8359300000000000 2013-01-01 7.8359300000000000 2014-01-01 11.4483000000000000 2015-01-01 12.9658000000000000 2016-01-01 12.5797000000000000