Year	Percent
1974-01-01	0.0216660000000000000
1975-01-01	0.0204379999999999980
1976-01-01	0.0326080000000000000
1977-01-01	0.0138039999999999990
1978-01-01	0.0149390000000000000
1979-01-01	0.0013570000000000001
1980-01-01	0.0093670000000000000
1981-01-01	0.0061420000000000000
1982-01-01	0.0032430000000000000
1983-01-01	0.0033079999999999997
1984-01-01	0.1917370000000000000
1985-01-01	0.1600390000000000100
1986-01-01	0.1801500000000000000
1987-01-01	0.1811750000000000000
1988-01-01	0.1649760000000000000
1989-01-01	0.3899660000000000000
1990-01-01	0.2554200000000000000
1991-01-01	0.4949199999999999700
1992-01-01	0.5030610000000000000
1993-01-01	0.4017940000000000000
1994-01-01	0.4280750000000000000
1995-01-01	0.2880780000000000000
1996-01-01	0.1562420000000000200
1997-01-01	0.3436349999999999700
1998-01-01	0.3065800000000000000
1999-01-01	0.3126280000000000000
2000-01-01	0.2906400000000000000
2001-01-01	0.2400070000000000300
2002-01-01	0.6668609999999999000
2003-01-01	0.2965190000000000300
2004-01-01	0.2636760000000000000
2005-01-01	1.6968599999999998000
2006-01-01	2.2828200000000000000
2007-01-01	2.9103700000000000000
2008-01-01	2.7909900000000003000
2009-01-01	2.7801000000000000000
2010-01-01	4.3799300000000000000
2011-01-01	2.8446400000000000000
2012-01-01	2.7757800000000000000
2013-01-01	2.8038200000000000000
2014-01-01	2.6811200000000000000
2015-01-01	2.7939300000000000000
2016-01-01	2.5043599999999997000
2017-01-01	2.2761500000000000000