Year	Percent
1996-01-01	73.7945
1997-01-01	78.4148
1998-01-01	79.5302
1999-01-01	65.1240
2000-01-01	63.7168
2001-01-01	57.5625
2002-01-01	56.8565
2003-01-01	54.8324
2004-01-01	52.7076
2005-01-01	56.1784
2006-01-01	56.0428
2007-01-01	51.5721
2008-01-01	49.4733
2009-01-01	48.4085
2010-01-01	54.5051
2011-01-01	56.6578
2012-01-01	54.0884
2013-01-01	53.4437
2014-01-01	52.4659