Year Percent 1996-01-01 23.0089000000000000 1997-01-01 25.5319000000000000 1998-01-01 16.5025000000000000 1999-01-01 12.7232000000000000 2000-01-01 11.4350000000000000 2001-01-01 1.8934900000000001 2002-01-01 14.0777000000000000 2003-01-01 1.3698600000000000 2004-01-01 14.7773000000000000 2005-01-01 18.6235000000000000 2006-01-01 20.0531000000000000 2007-01-01 19.0614000000000000 2008-01-01 15.4286000000000000 2009-01-01 11.1721000000000000 2010-01-01 12.9365000000000000 2011-01-01 12.5356000000000000 2012-01-01 13.4387000000000000 2013-01-01 13.1298000000000000 2014-01-01 12.3806000000000000 2015-01-01 12.1863000000000000 2016-01-01 10.1890000000000000