Year	Percent
1996-01-01	66.1632
1997-01-01	67.4059
1998-01-01	63.6269
1999-01-01	61.4291
2000-01-01	58.3348
2001-01-01	56.1336
2002-01-01	55.4686
2003-01-01	56.7797
2004-01-01	58.8273
2005-01-01	55.3784
2006-01-01	55.0655
2007-01-01	54.8502
2008-01-01	55.3230
2009-01-01	62.6823
2010-01-01	60.5413
2011-01-01	65.6260
2012-01-01	51.2629
2013-01-01	68.6414
2014-01-01	66.1192