Year	Percent
1996-01-01	83.9865
1997-01-01	84.5082
1998-01-01	84.6153
1999-01-01	84.9150
2000-01-01	84.5356
2001-01-01	84.8474
2002-01-01	82.8656
2003-01-01	81.7654
2004-01-01	77.8760
2005-01-01	73.3314
2006-01-01	65.6667
2007-01-01	52.6510
2008-01-01	52.6502
2009-01-01	44.4459
2010-01-01	38.9495
2011-01-01	37.4418
2012-01-01	40.3909
2013-01-01	40.5539
2014-01-01	37.8355
2015-01-01	50.4981
2016-01-01	40.7196