Year	Percent
2000-01-01	18.400
2001-01-01	20.150
2002-01-01	21.225
2003-01-01	20.750
2004-01-01	20.225
2005-01-01	19.425
2006-01-01	15.100
2007-01-01	10.450
2008-01-01	8.050
2009-01-01	8.750
2010-01-01	10.125
2011-01-01	10.500
2012-01-01	11.025
2013-01-01	11.225
2014-01-01	9.700
2015-01-01	7.825
2016-01-01	6.300
2017-01-01	4.975