Year	Percent
1995-01-01	65.5897893975000
1996-01-01	64.3472736925000
1997-01-01	61.7288755725000
1998-01-01	59.4924428625000
1999-01-01	60.1388655400000
2000-01-01	58.7269328450000
2001-01-01	60.3704113450000
2002-01-01	60.8720739475000
2003-01-01	60.9836959025000
2004-01-01	63.0136313500000
2005-01-01	62.9120036250000
2006-01-01	65.2543571200000
2007-01-01	67.1946017325000
2008-01-01	68.4316614950000
2009-01-01	68.0462655775000
2010-01-01	68.7511691100000
2011-01-01	70.7245969100000
2012-01-01	71.6166666666667
2013-01-01	72.8333333333334
2014-01-01	72.9000000000000
2015-01-01	73.2166666666667
2016-01-01	73.3833333333334
2017-01-01	74.4166666666666