Year	Percent
1999-01-01	31.050
2000-01-01	29.675
2001-01-01	26.925
2002-01-01	25.775
2003-01-01	23.800
2004-01-01	20.825
2005-01-01	19.225
2006-01-01	18.575
2007-01-01	17.700
2008-01-01	17.075
2009-01-01	16.200
2010-01-01	16.550
2011-01-01	16.175
2012-01-01	17.050
2013-01-01	17.025
2014-01-01	20.475
2015-01-01	23.125
2016-01-01	24.625
2017-01-01	24.825