Year	Percent
1996-01-01	67.1956
1997-01-01	74.4800
1998-01-01	75.9801
1999-01-01	56.3426
2000-01-01	69.3609
2001-01-01	62.1385
2002-01-01	67.9139
2003-01-01	61.9968
2004-01-01	63.6548
2005-01-01	55.1796
2006-01-01	52.2942
2007-01-01	52.2121
2008-01-01	49.5639
2009-01-01	48.1317
2010-01-01	51.8918
2011-01-01	56.4256
2012-01-01	55.0732
2013-01-01	52.6808
2014-01-01	55.5149