Year	% of total
1960	90.56603773584905
1961	95.6521739130435
1962	92.06349206349206
1963	92.42424242424244
1964	93.9655172413793
1965	92.55319148936171
1966	90.9090909090909
1967	88.659793814433
1968	92.5925925925926
1969	94.06779661016948
1970	94.36619718309858
1971	91.33333333333334
1972	92.40506329113923
1973	93.02325581395348
1974	91.2568306010929
1975	86.47058823529412
1976	87.87878787878789
1977	88.51674641148325
1978	85.05154639175257
1979	86.89956331877728
1980	88.01843317972352
1981	91.18644067796609
1982	87.3362445414847
1983	85.64102564102564
1984	81.76100628930817
1985	84.17721518987342
1986	85.45454545454547
1987	90.76923076923077
1988	94.03973509933776
1989	88.3720930232558
1990	96.94945205479452
1991	79.87027397260273
1992	85.885
1993	87.51906666666667
1994	86.54119999999999
1995	87.815
1996	88.09743902439024
1997	86.1745
1998	86.03346153846154
1999	86.1745
2000	88.008
2001	89.97731481481482
2002	86.09478260869565
2003	87.60055555555556
2004	88.66102739726027
2005	80.215625
2006	83.77890510948905
2007	86.14539682539683
2008	85.9453125
2009	75.98628865979381
2010	97.99741379310345
2011	90.51873873873875
2012	95.76922330097088
2013	110.33451327433627
2014	118.40770992366411
2015	135.99470198675496
2016	111.27448275862068