Year	Percent
1999-01-01	15.700
2000-01-01	13.925
2001-01-01	10.550
2002-01-01	11.475
2003-01-01	11.500
2004-01-01	10.950
2005-01-01	9.150
2006-01-01	8.475
2007-01-01	8.225
2008-01-01	11.250
2009-01-01	17.900
2010-01-01	19.875
2011-01-01	21.425
2012-01-01	24.800
2013-01-01	26.100
2014-01-01	24.450
2015-01-01	22.075
2016-01-01	19.625
2017-01-01	17.250