Year	Percent
1960-01-01	7.23215000000000000
1961-01-01	6.87321000000000000
1962-01-01	6.38628000000000000
1963-01-01	6.10028000000000100
1964-01-01	5.75344000000000000
1965-01-01	5.28342000000000000
1966-01-01	4.95012000000000000
1967-01-01	4.29791000000000000
1968-01-01	4.26174000000000050
1969-01-01	4.39371000000000000
1970-01-01	3.79763000000000030
1971-01-01	3.09173000000000000
1972-01-01	2.36802000000000000
1973-01-01	2.13416000000000000
1974-01-01	2.05135000000000000
1975-01-01	1.90143000000000000
1976-01-01	1.94575000000000000
1977-01-01	2.36362000000000000
1978-01-01	2.45777000000000000
1979-01-01	2.30766000000000000
1980-01-01	3.29099000000000030
1981-01-01	5.22825000000000000
1982-01-01	6.16217000000000000
1983-01-01	6.30457000000000000
1984-01-01	6.06913000000000000
1985-01-01	5.68794000000000000
1986-01-01	5.49038000000000000
1987-01-01	4.86520000000000000
1988-01-01	3.71735999999999980
1989-01-01	3.02263000000000000
1990-01-01	2.39098000000000000
1991-01-01	1.52559000000000000
1992-01-01	0.91481200000000010
1993-01-01	1.03847000000000000
1994-01-01	1.03541000000000000
1995-01-01	0.97277600000000000
1996-01-01	1.02140000000000000
1997-01-01	1.01706000000000000
1998-01-01	0.74856099999999990
1999-01-01	0.48028699999999996
2000-01-01	0.46695900000000000
2001-01-01	0.43429500000000000
2002-01-01	0.35963800000000000
2003-01-01	0.26244300000000000
2004-01-01	0.22744000000000000
2005-01-01	0.24811700000000000
2006-01-01	0.25479500000000000
2007-01-01	0.41766499999999995
2008-01-01	0.67376000000000000
2009-01-01	0.74181500000000000
2010-01-01	0.82336700000000000
2011-01-01	1.04209000000000000
2012-01-01	1.24401000000000000
2013-01-01	1.29316000000000000
2014-01-01	1.20227000000000020
2015-01-01	2.87072000000000000
2016-01-01	7.41488000000000000