Year Percent 2000-01-01 20.600000000000000 2001-01-01 20.600000000000000 2002-01-01 8.000000000000000 2003-01-01 6.400000000000000 2004-01-01 6.900000000000000 2005-01-01 5.300000000000000 2006-01-01 4.400000000000000 2007-01-01 3.700000000000000 2008-01-01 5.200000000000000 2009-01-01 16.400000000000000 2010-01-01 13.327300000000000 2011-01-01 10.660100000000000 2012-01-01 14.499600000000000 2013-01-01 11.577400000000000 2014-01-01 11.729000000000001 2015-01-01 14.444200000000000 2016-01-01 16.405100000000000