Year	Percent
1990-01-01	27.9465
1991-01-01	30.1179
1992-01-01	32.9443
1993-01-01	35.3705
1994-01-01	36.6319
1995-01-01	36.9941
1996-01-01	37.5226
1997-01-01	29.6611
1998-01-01	45.9516
1999-01-01	60.3533
2000-01-01	50.7187
2001-01-01	53.9559
2002-01-01	66.1627
2003-01-01	58.6034
2004-01-01	62.4206
2005-01-01	56.1694
2006-01-01	57.2202
2007-01-01	55.0652
2008-01-01	47.7618
2009-01-01	71.7533
2010-01-01	65.4993
2011-01-01	61.3757
2012-01-01	71.0821
2013-01-01	72.5874
2014-01-01	67.5039
2015-01-01	66.9193
2016-01-01	64.0794