Year	Percent
1996-01-01	62.150
1997-01-01	61.150
1998-01-01	57.155
1999-01-01	58.310
2000-01-01	59.400
2001-01-01	58.080
2002-01-01	59.060
2003-01-01	58.345
2004-01-01	57.825
2005-01-01	57.140
2006-01-01	54.590
2007-01-01	55.590
2008-01-01	53.605
2009-01-01	54.870
2010-01-01	56.985
2011-01-01	56.910
2012-01-01	55.550
2013-01-01	56.070
2014-01-01	78.760
2015-01-01	78.705