Year	Percent
1999-01-01	49.125
2000-01-01	50.525
2001-01-01	50.200
2002-01-01	52.525
2003-01-01	55.100
2004-01-01	57.125
2005-01-01	59.250
2006-01-01	60.325
2007-01-01	61.150
2008-01-01	62.175
2009-01-01	62.850
2010-01-01	63.600
2011-01-01	62.825
2012-01-01	62.925
2013-01-01	62.450
2014-01-01	61.950
2015-01-01	61.725
2016-01-01	60.250
2017-01-01	60.425