Year	% of total
1965	0.6710208463809609
1966	0.8430992327796982
1967	0.6565252201761409
1968	0.6765488407449639
1969	0.6752434430307769
1970	0.6051437216338881
1971	0.6402561024409764
1972	0.6738957299516021
1973	0.5724650002833985
1974	0.42665262048986036
1975	0.7962094568190698
1976	0.7482993197278911
1977	0.6366977181437484
1978	0.5402654347570762
1979	0.5954565846894245
1980	0.46909029988272744
1981	0.6913580246913581
1982	0.6417759838546923
1983	0.6010081426909655
1984	0.6881344333346007
1985	0.5784445439617854
1986	0.548745724059293
1987	0.5680863222293187
1988	0.5781137755276571
1989	0.5341266353402522
1990	0.625967083978056
1991	0.6474652070887428
1992	0.49865867129556574
1993	0.5043293331307914
1994	0.4803819185439356
1995	0.4791580927744135
1996	0.5899116557423767
1997	0.6102212051868803
1998	0.4167787039526754
1999	0.4784309579192218
2000	0.5058111448950016
2001	0.5107785253329672
2002	0.5365489393478441
2003	0.5008053887831307
2004	0.6081642340097306
2005	0.564940149904911
2006	0.5186982347527817
2007	0.5255255255255256
2008	0.5321673953778888
2009	0.6349559986632505
2010	0.5030638730566482
2011	0.6163413753852134
2012	0.6149848419229104
2013	0.7031095266389384
2014	1.02408818726184
2015	0.7712082262210797