Year	Percent
2002-01-01	18.30
2003-01-01	22.50
2004-01-01	18.80
2005-01-01	16.20
2006-01-01	18.50
2007-01-01	21.00
2008-01-01	23.60
2009-01-01	20.70
2010-01-01	19.70
2011-01-01	20.60
2012-01-01	20.50
2013-01-01	20.89
2014-01-01	20.67
2015-01-01	20.30