Year	Percent
1980-01-01	0.25578100000000000
1981-01-01	0.27675200000000000
1982-01-01	0.26188300000000000
1983-01-01	0.24519300000000000
1984-01-01	0.22496200000000000
1985-01-01	0.20642300000000000
1986-01-01	0.20176700000000000
1987-01-01	0.17269200000000000
1988-01-01	0.15510100000000000
1989-01-01	0.07207000000000001
1990-01-01	0.07207000000000001
1991-01-01	0.07207000000000001
1992-01-01	0.07207000000000001
1993-01-01	0.07207000000000001
1994-01-01	0.07207000000000001
1995-01-01	0.07207000000000001
1996-01-01	0.07207000000000001
1997-01-01	0.07207000000000001
1998-01-01	10.23690000000000000
1999-01-01	10.25450000000000000
2000-01-01	11.62730000000000000
2001-01-01	10.99150000000000000
2002-01-01	9.74957000000000000
2003-01-01	8.05926000000000000
2004-01-01	7.16158999999999950
2005-01-01	6.95541000000000050
2006-01-01	6.63043000000000050
2007-01-01	5.76575000000000000
2008-01-01	4.65651999999999950
2009-01-01	4.70100000000000050
2010-01-01	10.12200000000000000
2011-01-01	10.00070000000000000
2012-01-01	9.27544000000000000
2013-01-01	8.01081999999999900
2014-01-01	9.08363999999999900
2015-01-01	13.48320000000000000
2016-01-01	12.36030000000000000