Year	Percent
1996-01-01	57.1061
1997-01-01	67.4451
1998-01-01	54.3069
1999-01-01	62.2426
2000-01-01	65.8131
2001-01-01	69.7447
2002-01-01	57.6395
2003-01-01	58.1269
2004-01-01	61.7389
2005-01-01	59.1708
2006-01-01	62.3725
2007-01-01	61.7384
2008-01-01	68.8378
2009-01-01	69.4250
2010-01-01	56.7613
2011-01-01	54.1527
2012-01-01	56.9217
2013-01-01	57.9249
2014-01-01	52.2892