Year	Percent
1996-01-01	56.0616
1997-01-01	61.6377
1998-01-01	61.6124
1999-01-01	61.3187
2000-01-01	59.3830
2001-01-01	60.8786
2002-01-01	72.6257
2003-01-01	73.3639
2004-01-01	73.6935
2005-01-01	75.0408
2006-01-01	75.0316
2007-01-01	73.1570
2008-01-01	79.6569
2009-01-01	81.2810
2010-01-01	72.0987
2011-01-01	71.3680
2012-01-01	69.0360
2013-01-01	68.0076
2014-01-01	66.5653
2015-01-01	68.5171
2016-01-01	69.2643