Year	Percent
1996-01-01	63.25430000000000
1997-01-01	60.31910000000000
1998-01-01	58.19020000000000
1999-01-01	59.51920000000000
2000-01-01	62.34390000000000
2001-01-01	67.38690000000000
2002-01-01	68.54680000000000
2003-01-01	79.09570000000000
2004-01-01	78.60060000000000
2005-01-01	76.82630000000000
2006-01-01	77.30920000000000
2007-01-01	78.99570000000000
2008-01-01	77.49240000000000
2009-01-01	75.45200000000000
2010-01-01	74.87790000000000
2011-01-01	74.38600000000001
2012-01-01	74.83220000000000
2013-01-01	73.52870000000000
2014-01-01	73.70260000000000
2015-01-01	79.41510000000000
2016-01-01	71.88900000000000