Year	Percent
1996-01-01	77.1268
1997-01-01	74.2134
1998-01-01	69.5985
1999-01-01	63.9771
2000-01-01	67.6111
2001-01-01	62.3167
2002-01-01	64.8656
2003-01-01	60.6641
2004-01-01	62.6855
2005-01-01	63.9365
2006-01-01	59.7534
2007-01-01	62.2972
2008-01-01	64.3430
2009-01-01	63.3964
2010-01-01	68.2733
2011-01-01	58.8972
2012-01-01	65.8236
2013-01-01	66.4541
2014-01-01	67.3620