Year	Percent
1983-01-01	14.2479
1984-01-01	16.1150
1985-01-01	15.8736
1986-01-01	15.2516
1987-01-01	17.4235
1988-01-01	19.3212
1989-01-01	22.5204
1990-01-01	24.3913
1991-01-01	25.5641
1992-01-01	30.2844
1993-01-01	32.1784
1994-01-01	33.0868
1995-01-01	30.5355
1996-01-01	25.3172
1997-01-01	27.6032
1998-01-01	28.0319
1999-01-01	22.6165
2000-01-01	20.0474
2001-01-01	22.1642
2002-01-01	24.7099
2003-01-01	28.8733
2004-01-01	33.9719
2005-01-01	37.9753
2006-01-01	44.5942
2007-01-01	53.3274
2008-01-01	64.2786
2009-01-01	57.8276
2010-01-01	57.6966
2011-01-01	74.0463
2012-01-01	84.7143
2013-01-01	87.0866
2014-01-01	81.5872
2015-01-01	79.6173
2016-01-01	81.4131