Year	Percent
1999-01-01	48.850
2000-01-01	49.025
2001-01-01	52.000
2002-01-01	52.950
2003-01-01	55.925
2004-01-01	56.475
2005-01-01	56.825
2006-01-01	56.750
2007-01-01	55.125
2008-01-01	53.025
2009-01-01	53.500
2010-01-01	55.850
2011-01-01	58.025
2012-01-01	58.925
2013-01-01	59.875
2014-01-01	60.300
2015-01-01	62.600
2016-01-01	66.350
2017-01-01	67.600