Year	Percent
1996-01-01	79.0424
1997-01-01	72.7819
1998-01-01	74.8097
1999-01-01	73.5681
2000-01-01	73.3756
2001-01-01	69.4944
2002-01-01	69.0992
2003-01-01	73.3011
2004-01-01	71.7463
2005-01-01	70.6434
2006-01-01	72.6569
2007-01-01	69.8664
2008-01-01	68.9145
2009-01-01	74.7255
2010-01-01	81.0351
2011-01-01	85.3874
2012-01-01	84.3437
2013-01-01	80.5671
2014-01-01	78.2791
2015-01-01	75.3867
2016-01-01	75.1728