Year	Percent
2000-01-01	13.6
2001-01-01	16.9
2002-01-01	20.2
2003-01-01	24.2
2004-01-01	23.6
2005-01-01	26.5
2006-01-01	18.2
2007-01-01	19.3
2008-01-01	14.8
2009-01-01	13.4
2010-01-01	13.6
2011-01-01	10.9
2012-01-01	9.8
2013-01-01	9.3
2014-01-01	8.5
2015-01-01	7.2