Year	Percent
2000-01-01	23.8
2001-01-01	28.8
2002-01-01	25
2003-01-01	21.1
2004-01-01	20.6
2005-01-01	21.1
2006-01-01	18.1
2007-01-01	13.8
2008-01-01	13.8
2009-01-01	14.7
2010-01-01	15.0
2011-01-01	14.9
2012-01-01	14.9
2013-01-01	15.5
2014-01-01	17.6