Year	Percent
1983-01-01	13.1634000000000000
1984-01-01	11.8322000000000000
1985-01-01	11.0834000000000000
1986-01-01	5.3149600000000000
1987-01-01	16.4945000000000000
1988-01-01	28.7705000000000000
1989-01-01	38.3253000000000000
1990-01-01	28.2910000000000000
1991-01-01	24.5454000000000000
1992-01-01	33.4976000000000000
1993-01-01	27.1850000000000000
1994-01-01	8.6224400000000000
1995-01-01	5.4163500000000000
1996-01-01	3.7025500000000000
1997-01-01	6.1676500000000000
1998-01-01	4.8170300000000000
1999-01-01	4.7447800000000000
2000-01-01	5.3486100000000000
2001-01-01	7.6679400000000000
2002-01-01	6.9060399999999990
2003-01-01	7.9952000000000000
2004-01-01	5.1905700000000000
2005-01-01	4.3088000000000000
2006-01-01	5.9647900000000000
2007-01-01	4.0862200000000000
2008-01-01	4.6662600000000000
2009-01-01	4.3676699999999995
2010-01-01	4.2338900000000000
2011-01-01	4.0140900000000000
2012-01-01	4.0279600000000000
2013-01-01	7.8924600000000010
2014-01-01	4.2633000000000000
2015-01-01	4.3889400000000000
2016-01-01	3.5332500000000000