Year	Percent
1996-01-01	68.1573
1997-01-01	70.7448
1998-01-01	66.7263
1999-01-01	68.7581
2000-01-01	66.9022
2001-01-01	64.1972
2002-01-01	62.6425
2003-01-01	79.1112
2004-01-01	83.0757
2005-01-01	76.2037
2006-01-01	80.2668
2007-01-01	73.9229
2008-01-01	71.0462
2009-01-01	70.4115
2010-01-01	67.2796
2011-01-01	70.3079
2012-01-01	71.4258
2013-01-01	69.7278
2014-01-01	70.9825