Year	Percent
2000-01-01	31.350
2001-01-01	30.175
2002-01-01	29.125
2003-01-01	30.150
2004-01-01	29.575
2005-01-01	30.500
2006-01-01	30.625
2007-01-01	31.800
2008-01-01	33.350
2009-01-01	34.475
2010-01-01	36.675
2011-01-01	39.625
2012-01-01	41.775
2013-01-01	43.975
2014-01-01	45.550
2015-01-01	46.875
2016-01-01	48.300
2017-01-01	50.125