Year	Percent
1983-01-01	32.8834000000000000
1984-01-01	30.5075000000000000
1985-01-01	28.1207000000000000
1986-01-01	39.6924000000000000
1987-01-01	41.7895000000000000
1988-01-01	37.4761000000000000
1989-01-01	34.2185000000000000
1990-01-01	29.9692000000000000
1991-01-01	25.3898000000000000
1992-01-01	20.4564000000000000
1993-01-01	16.3367000000000000
1994-01-01	14.7394000000000000
1995-01-01	12.4564000000000000
1996-01-01	13.6426000000000000
1997-01-01	13.1106000000000000
1998-01-01	13.5512000000000000
1999-01-01	11.9706000000000000
2000-01-01	9.0290800000000000
2001-01-01	5.7789000000000000
2002-01-01	5.3382000000000000
2003-01-01	4.9086000000000000
2004-01-01	5.4793900000000000
2005-01-01	5.8712900000000000
2006-01-01	6.2710900000000000
2007-01-01	6.6813300000000000
2008-01-01	4.6484400000000000
2009-01-01	4.7681000000000000
2010-01-01	4.2742900000000010
2011-01-01	3.8182699999999996
2012-01-01	4.3693599999999995
2013-01-01	4.5587400000000000
2014-01-01	5.6433599999999995
2015-01-01	6.1241300000000000
2016-01-01	6.9182200000000000