Year	Percent
2000-01-01	27.175
2001-01-01	28.750
2002-01-01	30.800
2003-01-01	33.075
2004-01-01	33.725
2005-01-01	37.275
2006-01-01	39.025
2007-01-01	39.975
2008-01-01	41.375
2009-01-01	41.775
2010-01-01	42.800
2011-01-01	43.575
2012-01-01	43.350
2013-01-01	43.875
2014-01-01	45.175
2015-01-01	46.850
2016-01-01	49.125
2017-01-01	50.625