Year	Percent
1995-01-01	50.3427670425000
1996-01-01	50.0713751025000
1997-01-01	49.4095232325000
1998-01-01	48.8453692300000
1999-01-01	49.0202063875000
2000-01-01	49.5077626375000
2001-01-01	49.1892531450000
2002-01-01	48.5387801350000
2003-01-01	48.6285735225000
2004-01-01	49.2368936950000
2005-01-01	50.2395697025000
2006-01-01	50.9295660850000
2007-01-01	52.1535733775000
2008-01-01	53.0628154425000
2009-01-01	52.6240383200000
2010-01-01	53.5313517275000
2011-01-01	54.1583603775000
2012-01-01	59.2250000000000
2013-01-01	59.7500000000000
2014-01-01	60.4250000000000
2015-01-01	60.7333333333333
2016-01-01	61.0666666666667
2017-01-01	61.3083333333333