Year Percent 2000-01-01 10.800000000000000 2001-01-01 14.900000000000000 2002-01-01 9.000000000000000 2003-01-01 3.700000000000000 2004-01-01 2.800000000000000 2005-01-01 3.100000000000000 2006-01-01 2.800000000000000 2007-01-01 1.900000000000000 2008-01-01 1.700000000000000 2009-01-01 4.200000000000000 2010-01-01 3.548800000000000 2011-01-01 4.159600000000000 2012-01-01 5.501869999999999 2013-01-01 4.447330000000000 2014-01-01 4.371300000000000 2015-01-01 6.834950000000000 2016-01-01 12.791200000000000