Year	Percent
1983-01-01	13.7973000000000000
1984-01-01	11.4936000000000000
1985-01-01	12.2901000000000000
1986-01-01	25.2495000000000000
1987-01-01	41.6745000000000000
1988-01-01	29.6581000000000000
1989-01-01	25.0873000000000000
1990-01-01	10.2731000000000000
1991-01-01	9.2470600000000010
1992-01-01	7.9095600000000010
1993-01-01	6.4615200000000000
1994-01-01	4.1151700000000000
1995-01-01	2.1061900000000002
1996-01-01	1.3249500000000000
1997-01-01	1.0640600000000000
1998-01-01	1.1021700000000000
1999-01-01	3.3508800000000000
2000-01-01	3.1169100000000000
2001-01-01	3.2463500000000000
2002-01-01	2.3057400000000000
2003-01-01	2.8134099999999997
2004-01-01	2.9168700000000000
2005-01-01	2.8259100000000000
2006-01-01	3.2173599999999998
2007-01-01	4.0016400000000000
2008-01-01	3.5220599999999997
2009-01-01	2.6286500000000000
2010-01-01	2.0690300000000000
2011-01-01	2.2523800000000000
2012-01-01	3.1724000000000000
2013-01-01	3.0010200000000000
2014-01-01	3.4625199999999996
2015-01-01	3.5719900000000000
2016-01-01	3.8988800000000000