Year	Percent
1999-01-01	47.850
2000-01-01	51.025
2001-01-01	52.900
2002-01-01	55.225
2003-01-01	57.375
2004-01-01	59.650
2005-01-01	62.300
2006-01-01	64.425
2007-01-01	66.350
2008-01-01	66.525
2009-01-01	64.400
2010-01-01	63.850
2011-01-01	63.375
2012-01-01	61.975
2013-01-01	61.175
2014-01-01	62.275
2015-01-01	63.675
2016-01-01	65.550
2017-01-01	67.075