Year	% of total
1960	100
1961	100
1962	100
1963	100
1964	100
1965	100
1966	100
1967	100
1968	100
1969	100
1970	100
1971	100
1972	100
1973	100
1974	100
1975	100
1976	100
1977	100
1978	100
1979	100
1980	72.34042553191489
1981	65.8119658119658
1982	67.91044776119404
1983	66.93548387096774
1984	70.07299270072991
1985	79.80295566502463
1986	78.07486631016042
1987	72.10884353741497
1988	82.11920529801326
1989	80.23255813953489
1990	146.68
1991	200.01818181818177
1992	198.6291666666667
1993	209.54285714285717
1994	258.5235
1995	225.60021739130437
1996	103.3744761904762
1997	90.19637096774193
1998	85.75138461538462
1999	103.03753521126762
2000	96.3486274509804
2001	91.87429347826087
2002	92.19391509433962
2003	93.67798319327731
2004	94.2114624505929
2005	81.65010791366907
2006	81.66973890339425
2007	84.78371298405467
2008	85.9848275862069
2009	85.1992340425532
2010	87.41608267716535
2011	86.96238955823293
2012	86.72377637130802
2013	86.34250996015936
2014	81.59241379310345
2015	84.48180300500835
2016	72.73136929460581