Year	Percent
1996-01-01	52.6509
1997-01-01	57.1742
1998-01-01	56.9897
1999-01-01	63.0268
2000-01-01	69.8267
2001-01-01	63.1038
2002-01-01	60.1178
2003-01-01	61.8096
2004-01-01	65.3194
2005-01-01	68.6693
2006-01-01	77.1869
2007-01-01	63.6863
2008-01-01	57.3611
2009-01-01	60.3543
2010-01-01	61.0249
2011-01-01	57.4484
2012-01-01	62.8242
2013-01-01	59.7295
2014-01-01	49.8608