Year	Percent
1990-01-01	0.45819899999999997
1991-01-01	0.45204399999999995
1992-01-01	0.42731499999999994
1993-01-01	0.48664600000000000
1994-01-01	0.40164800000000000
1995-01-01	0.33442000000000000
1996-01-01	0.34261300000000000
1997-01-01	0.38035300000000000
1998-01-01	0.35104300000000000
1999-01-01	0.32865100000000000
2000-01-01	0.27215900000000004
2001-01-01	0.27367900000000000
2002-01-01	0.33481700000000003
2003-01-01	0.39623900000000000
2004-01-01	0.37908100000000000
2005-01-01	0.42295200000000005
2006-01-01	0.43712300000000000
2007-01-01	0.44222200000000000
2008-01-01	0.40694200000000000
2009-01-01	0.32411599999999996
2010-01-01	0.26930600000000000
2011-01-01	0.23152399999999998
2012-01-01	0.22072600000000003
2013-01-01	0.20666100000000000
2014-01-01	0.21849800000000000
2015-01-01	0.22298300000000000
2016-01-01	0.21888700000000000