Year	Percent
1996-01-01	89.8008
1997-01-01	89.1555
1998-01-01	90.0221
1999-01-01	91.6223
2000-01-01	88.7797
2001-01-01	84.8783
2002-01-01	83.0113
2003-01-01	82.6134
2004-01-01	78.5865
2005-01-01	78.4866
2006-01-01	81.1143
2007-01-01	76.7036
2008-01-01	75.2942
2009-01-01	74.2132
2010-01-01	71.0925
2011-01-01	70.0964
2012-01-01	66.8051
2013-01-01	65.8696
2014-01-01	64.6896
2015-01-01	64.7201
2016-01-01	63.9981