Year	Percent
1996-01-01	73.2604
1997-01-01	74.3730
1998-01-01	68.0982
1999-01-01	60.9209
2000-01-01	65.4926
2001-01-01	66.5752
2002-01-01	69.3603
2003-01-01	74.7915
2004-01-01	86.1769
2005-01-01	81.7663
2006-01-01	72.4757
2007-01-01	68.0351
2008-01-01	59.7279
2009-01-01	64.7427
2010-01-01	67.4425
2011-01-01	63.1969
2012-01-01	64.7681
2013-01-01	67.9399
2014-01-01	63.6766