Year	Percent
1961-01-01	0.83333300000000000
1962-01-01	0.75980400000000000
1963-01-01	0.79383900000000010
1964-01-01	1.56044000000000000
1965-01-01	1.88272000000000020
1966-01-01	1.88192000000000000
1967-01-01	2.14040999999999970
1968-01-01	2.19614000000000000
1969-01-01	1.88752000000000000
1970-01-01	1.70311000000000000
1971-01-01	1.62988000000000000
1972-01-01	1.65235000000000000
1973-01-01	2.35612000000000000
1974-01-01	2.39574000000000000
1975-01-01	3.10796000000000000
1976-01-01	4.07037000000000000
1977-01-01	4.71639000000000050
1978-01-01	4.71639000000000050
1979-01-01	5.29008000000000100
1980-01-01	3.86976000000000000
1981-01-01	3.65761999999999960
1982-01-01	5.38401000000000000
1983-01-01	7.94051000000000100
1984-01-01	7.94051000000000100
1985-01-01	7.94051000000000100
1986-01-01	7.94051000000000100
1987-01-01	7.94051000000000100
1988-01-01	7.94051000000000100
1989-01-01	7.01758999999999900
1990-01-01	7.09265000000000000
1991-01-01	6.94995000000000000
1992-01-01	8.03619000000000000
1993-01-01	9.23023000000000000
1994-01-01	8.27821000000000100
1995-01-01	7.59003000000000050
1996-01-01	6.90478999999999900
1997-01-01	6.98693000000000000
1998-01-01	9.92566000000000000
1999-01-01	8.38972000000000000
2000-01-01	5.34354000000000000
2001-01-01	7.18578999999999900
2002-01-01	8.16605000000000000
2003-01-01	8.92718000000000000
2004-01-01	7.91666000000000000
2005-01-01	5.93826999999999900
2006-01-01	4.12871999999999950
2007-01-01	4.40837000000000000
2008-01-01	2.20670000000000000
2009-01-01	0.92908899999999990
2010-01-01	0.97686700000000000
2011-01-01	0.53616100000000000
2012-01-01	0.26523800000000003
2013-01-01	0.23967900000000000
2014-01-01	2.66082000000000000
2015-01-01	9.28291000000000100