Year	Percent
1996-01-01	71.9841
1997-01-01	61.2892
1998-01-01	57.8386
1999-01-01	56.5331
2000-01-01	53.6373
2001-01-01	58.7537
2002-01-01	65.6698
2003-01-01	61.2075
2004-01-01	60.2471
2005-01-01	54.5388
2006-01-01	55.4171
2007-01-01	55.0655
2008-01-01	52.9118
2009-01-01	54.1203
2010-01-01	54.4575
2011-01-01	54.1058
2012-01-01	49.6046
2013-01-01	40.6859
2014-01-01	37.8430
2015-01-01	46.3946
2016-01-01	50.5491