Year	Percent
2000-01-01	58.850
2001-01-01	59.400
2002-01-01	59.775
2003-01-01	61.550
2004-01-01	61.200
2005-01-01	61.800
2006-01-01	66.700
2007-01-01	68.125
2008-01-01	68.400
2009-01-01	59.825
2010-01-01	57.200
2011-01-01	62.700
2012-01-01	64.750
2013-01-01	66.275
2014-01-01	67.875
2015-01-01	69.825
2016-01-01	70.125
2017-01-01	72.100