Year	Percent
1975-01-01	1.4893100000000001
1976-01-01	1.4969100000000000
1977-01-01	1.2298400000000000
1978-01-01	1.2583200000000000
1979-01-01	0.8675390000000000
1980-01-01	0.4249070000000000
1981-01-01	0.5418950000000000
1982-01-01	0.6483720000000001
1983-01-01	0.6177260000000000
1984-01-01	0.9681660000000000
1985-01-01	1.6341700000000001
1986-01-01	4.0324100000000000
1987-01-01	9.2080000000000000
1988-01-01	9.3490300000000000
1989-01-01	7.8909800000000000
1990-01-01	8.5648100000000010
1991-01-01	8.0650500000000000
1992-01-01	6.9958200000000000
1993-01-01	7.2481200000000000
1994-01-01	10.6120000000000000
1995-01-01	11.5489000000000000
1996-01-01	13.1610000000000000
1997-01-01	23.6466000000000000
1998-01-01	45.4747000000000000
1999-01-01	108.8400000000000000
2000-01-01	206.6920000000000000
2001-01-01	242.9450000000000000
2002-01-01	145.0580000000000000
2003-01-01	63.9544000000000000
2004-01-01	71.9164000000000000
2005-01-01	79.4877000000000000
2006-01-01	98.3288000000000000
2007-01-01	131.2610000000000000
2008-01-01	128.5290000000000000
2009-01-01	96.7077000000000000
2010-01-01	89.8425000000000000
2011-01-01	86.3071000000000000
2012-01-01	71.1845000000000000
2013-01-01	66.0423000000000000
2014-01-01	69.0397000000000000
2015-01-01	75.2518000000000000
2016-01-01	62.5129000000000000
2017-01-01	50.7435000000000000