Year	Percent
1974-01-01	4.00563000000000000
1975-01-01	2.93948000000000000
1976-01-01	1.91497000000000000
1977-01-01	1.67357000000000000
1978-01-01	1.50889000000000000
1979-01-01	1.89497999999999990
1980-01-01	3.01064000000000000
1981-01-01	3.50507000000000000
1982-01-01	3.31545000000000000
1983-01-01	2.45305000000000000
1984-01-01	3.01217000000000020
1985-01-01	2.54927000000000000
1986-01-01	2.15772000000000000
1987-01-01	2.31838000000000000
1988-01-01	1.95481000000000000
1989-01-01	2.85879000000000000
1990-01-01	2.15429000000000000
1991-01-01	1.87897999999999990
1992-01-01	1.89828000000000000
1993-01-01	1.62014000000000000
1994-01-01	2.01010000000000000
1995-01-01	1.96299000000000020
1996-01-01	1.95177999999999980
1997-01-01	2.21087000000000000
1998-01-01	1.94220999999999980
1999-01-01	1.77150000000000000
2000-01-01	1.67045999999999980
2001-01-01	1.39125000000000000
2002-01-01	0.81198500000000010
2003-01-01	0.23378600000000002
2004-01-01	0.19862300000000000
2005-01-01	0.27282700000000000
2006-01-01	0.33177300000000000
2007-01-01	0.31016500000000000
2008-01-01	0.31910100000000000
2009-01-01	0.28450000000000000
2010-01-01	0.23565200000000000
2011-01-01	0.22618000000000002
2012-01-01	0.21522199999999997
2013-01-01	0.19998300000000000
2014-01-01	0.18615100000000000
2015-01-01	0.16224800000000000
2016-01-01	0.13731300000000002
2017-01-01	0.12313400000000000