Year	Percent
1984-01-01	71.9222
1985-01-01	74.9204
1986-01-01	73.6256
1987-01-01	63.6752
1988-01-01	59.5221
1989-01-01	57.5037
1990-01-01	56.3473
1991-01-01	50.8938
1992-01-01	50.1219
1993-01-01	59.7911
1994-01-01	66.8727
1995-01-01	63.5942
1996-01-01	61.0971
1997-01-01	62.4191
1998-01-01	58.7306
1999-01-01	51.9551
2000-01-01	48.4998
2001-01-01	42.7847
2002-01-01	36.0331
2003-01-01	31.2154
2004-01-01	29.3794
2005-01-01	30.8695
2006-01-01	30.7032
2007-01-01	34.0670
2008-01-01	43.4380
2009-01-01	48.1009
2010-01-01	51.0820
2011-01-01	55.5736
2012-01-01	55.3637
2013-01-01	56.9709
2014-01-01	65.5003
2015-01-01	77.6193
2016-01-01	82.9359