Year	% of total
1960	91.02564102564104
1961	92.5925925925926
1962	90.36144578313252
1963	89.70588235294117
1964	90.24390243902438
1965	92.7710843373494
1966	93.97590361445783
1967	92.95774647887323
1968	91.66666666666666
1969	91.86046511627906
1970	92.38095238095238
1971	90.9090909090909
1972	89.71962616822428
1973	86.95652173913044
1974	85.27131782945736
1975	84.0909090909091
1976	82.06521739130434
1977	82.90155440414509
1978	83.49514563106796
1979	84.46601941747572
1980	83.90243902439025
1981	84.688995215311
1982	75.1111111111111
1983	71.31147540983605
1984	70.68273092369479
1985	68.8715953307393
1986	79.56521739130436
1987	81.12449799196789
1988	79.92831541218638
1989	86.21908127208481
1990	85.9228431372549
1991	80.3073
1992	81.4888888888889
1993	91.67500000000001
1994	96.5
1995	97.37922222222223
1996	96.17226415094339
1997	106.25637795275588
1998	94.05435114503817
1999	95.12942028985508
2000	91.30081632653062
2001	91.675
2002	91.9755737704918
2003	87.92696132596686
2004	110.00999999999999
2005	112.58333333333333
2006	114.48715116279071
2007	110.1897549019608
2008	110.7325615763547
2009	106.50884422110552
2010	80.3460569105691
2011	73.86385714285714
2012	86.5412
2013	82.60824175824175
2014	88.55924836601308
2015	85.3792469879518
2016	84.6645588235294