Year	Percent
1960-01-01	0.14286300000000002
1961-01-01	0.17062300000000000
1962-01-01	0.20135600000000000
1963-01-01	0.31310300000000000
1964-01-01	0.43833999999999995
1965-01-01	0.56653100000000000
1966-01-01	0.76952800000000000
1967-01-01	1.14904000000000000
1968-01-01	1.18372000000000000
1969-01-01	0.99468200000000000
1970-01-01	0.88585700000000000
1971-01-01	0.83262099999999990
1972-01-01	0.87378600000000010
1973-01-01	1.04356000000000000
1974-01-01	1.01085000000000000
1975-01-01	1.23312000000000000
1976-01-01	1.19537999999999990
1977-01-01	1.02330000000000000
1978-01-01	0.99312400000000000
1979-01-01	1.11114000000000000
1980-01-01	2.07802000000000000
1981-01-01	1.98785000000000000
1982-01-01	1.99298000000000000
1983-01-01	3.66676999999999960
1984-01-01	4.91971000000000000
1985-01-01	4.37919000000000000
1986-01-01	2.92969000000000030
1987-01-01	2.33694000000000020
1988-01-01	2.10457000000000030
1989-01-01	1.65835000000000000
1990-01-01	1.65822999999999990
1991-01-01	1.49020000000000000
1992-01-01	0.80605799999999990
1993-01-01	0.73129600000000010
1994-01-01	0.79537200000000010
1995-01-01	0.89858900000000000
1996-01-01	3.29690000000000000
1997-01-01	5.34417000000000000
1998-01-01	6.12920000000000000
1999-01-01	6.93341000000000000
2000-01-01	7.31650000000000000
2001-01-01	7.93673000000000100
2002-01-01	4.57913000000000000
2003-01-01	1.83410000000000000
2004-01-01	1.54597000000000000
2005-01-01	1.30469000000000000
2006-01-01	1.02352999999999980
2007-01-01	0.87049400000000010
2008-01-01	0.63470300000000000
2009-01-01	0.50466099999999990
2010-01-01	0.41432100000000000
2011-01-01	0.31167200000000000
2012-01-01	0.28473100000000000
2013-01-01	0.28473000000000004
2014-01-01	0.26909099999999997
2015-01-01	0.23161500000000002
2016-01-01	0.28960300000000000