Year	Percent
1960-01-01	1.4198700000000000
1961-01-01	1.2970700000000002
1962-01-01	1.1346700000000000
1963-01-01	0.9585799999999999
1964-01-01	0.8563850000000001
1965-01-01	0.7832319999999999
1966-01-01	0.7674979999999999
1967-01-01	0.6775710000000000
1968-01-01	0.5735680000000001
1969-01-01	0.5456770000000001
1970-01-01	0.8376780000000000
1971-01-01	1.2736100000000001
1972-01-01	1.3496100000000000
1973-01-01	1.3303800000000000
1974-01-01	1.0131400000000000
1975-01-01	1.7621500000000000
1976-01-01	2.7068700000000000
1977-01-01	2.9565799999999998
1978-01-01	4.3450100000000000
1979-01-01	4.4659699999999996
1980-01-01	4.1740100000000000
1981-01-01	5.0758700000000000
1982-01-01	6.0872000000000000
1983-01-01	8.6870400000000000
1984-01-01	11.2375000000000000
1985-01-01	13.7770000000000010
1986-01-01	13.6401000000000000
1987-01-01	12.5340000000000000
1988-01-01	12.7613000000000000
1989-01-01	11.7115000000000000
1990-01-01	10.3467000000000000
1991-01-01	11.1011000000000000
1992-01-01	12.2415000000000000
1993-01-01	12.6610000000000000
1994-01-01	12.5278000000000000
1995-01-01	14.1966000000000000
1996-01-01	13.1436000000000000
1997-01-01	12.2346000000000000
1998-01-01	12.2157000000000000
1999-01-01	11.2709999999999990
2000-01-01	11.1667000000000000
2001-01-01	11.3980000000000000
2002-01-01	11.5279000000000000
2003-01-01	10.6389000000000000
2004-01-01	9.3218800000000000
2005-01-01	6.9712800000000000
2006-01-01	5.5678700000000000
2007-01-01	4.5038900000000000
2008-01-01	3.2513300000000000
2009-01-01	3.9292500000000000
2010-01-01	3.0839200000000000
2011-01-01	2.4103100000000000
2012-01-01	2.4103100000000000
2013-01-01	2.4103100000000000
2014-01-01	31.3788000000000000