Year	% of total
1971	90.28871391076116
1972	90.5
1973	91.4027149321267
1974	91.33333333333333
1975	91.8580375782881
1976	92.39766081871345
1977	92.9453262786596
1978	93.54838709677419
1979	94.0828402366864
1980	94.0828402366864
1981	94.3899018232819
1982	93.77777777777779
1983	94.39252336448598
1984	94.79553903345726
1985	94.76961394769614
1986	94.7565543071161
1987	94.91329479768787
1988	92.25589225589226
1989	92.18241042345277
1990	93.01587301587301
1991	93.70485036119712
1992	94.77186311787072
1993	90.93539054966249
1994	89.34579439252337
1995	80.12367491166079
1996	82.37738985868661
1997	89.23315259488768
1998	90.62038404726735
1999	94.77825464949929
2000	89.83790523690773
2001	91.49048625792811
2002	79.06066536203522
2003	72.57914338919925
2004	75.30918727915194
2005	79.24528301886792
2006	84.95284952849529
2007	88.32831325301204
2008	86.87994248741913
2009	86.42407277816655
2010	83.64759427828349
2011	84.00507775309426
2012	82.66666666666667
2013	83.60011232799775
2014	83.60699865410498
2015	83.6156763590392