Year	Percent
1999-01-01	45.775
2000-01-01	46.525
2001-01-01	49.775
2002-01-01	50.425
2003-01-01	52.900
2004-01-01	53.250
2005-01-01	53.550
2006-01-01	54.275
2007-01-01	52.925
2008-01-01	51.500
2009-01-01	51.675
2010-01-01	53.650
2011-01-01	55.300
2012-01-01	55.800
2013-01-01	56.850
2014-01-01	57.600
2015-01-01	59.550
2016-01-01	63.625
2017-01-01	65.200