Year	Percent
1996-01-01	79.7058
1997-01-01	70.9579
1998-01-01	66.8117
1999-01-01	65.1073
2000-01-01	73.8498
2001-01-01	67.6220
2002-01-01	60.2357
2003-01-01	62.2443
2004-01-01	65.4122
2005-01-01	58.0448
2006-01-01	57.6342
2007-01-01	56.4100
2008-01-01	65.7603
2009-01-01	52.8946
2010-01-01	54.5676
2011-01-01	56.6625
2012-01-01	56.1919
2013-01-01	60.4029
2014-01-01	59.9345