Year	Percent
1995-01-01	56.7335045375000
1996-01-01	56.3309543375000
1997-01-01	56.2744423250000
1998-01-01	56.3364702950000
1999-01-01	56.8551965050000
2000-01-01	57.5165412300000
2001-01-01	57.5037541100000
2002-01-01	57.3820233650000
2003-01-01	57.7808619150000
2004-01-01	58.2843435525000
2005-01-01	58.6020885350000
2006-01-01	59.1471052750000
2007-01-01	59.8744078700000
2008-01-01	60.1822074300000
2009-01-01	60.6321431175000
2010-01-01	61.1092151975000
2011-01-01	61.1720721825000
2012-01-01	67.7333333333333
2013-01-01	67.8833333333334
2014-01-01	68.4916666666667
2015-01-01	68.3750000000000
2016-01-01	68.4416666666667
2017-01-01	68.2583333333334