Year	Percent
1995-01-01	60.7769166425000
1996-01-01	60.4733972575000
1997-01-01	60.4154852125000
1998-01-01	60.4821790050000
1999-01-01	60.9741370900000
2000-01-01	61.5382648475000
2001-01-01	61.4065698900000
2002-01-01	61.2170336025000
2003-01-01	61.7032353300000
2004-01-01	62.1984775025000
2005-01-01	62.4251045750000
2006-01-01	62.9178581650000
2007-01-01	63.6559866425000
2008-01-01	63.7662543750000
2009-01-01	64.1219369525000
2010-01-01	64.5207504600000
2011-01-01	64.5629566875000
2012-01-01	71.4750000000000
2013-01-01	71.6000000000000
2014-01-01	72.1750000000000
2015-01-01	72.1833333333334
2016-01-01	72.1166666666667
2017-01-01	72.1250000000000