Year	% of total
1960	91.25636672325977
1961	92.25978647686833
1962	92.6873857404022
1963	93.29371816638371
1964	93.72485921158487
1965	94.22310756972111
1966	93.82632293080054
1967	93.54354354354354
1968	92.94294294294293
1969	94.49541284403671
1970	94.6360153256705
1971	94.44444444444444
1972	94.74954737477368
1973	94.22222222222224
1974	93.87096774193547
1975	93.36609336609337
1976	93.09701492537313
1977	92.7968851395198
1978	93.93358876117497
1979	94.3341121495327
1980	92.90201005025128
1981	92.97407912687585
1982	93.0775018811136
1983	94.6205571565802
1984	95.11158342189161
1985	95.21690767519468
1986	94.69434832756632
1987	94.23274974253346
1988	95.42334096109842
1989	94.29000751314801
1990	97.24693506493507
1991	98.51391304347827
1992	103.09113207547169
1993	93.92093541202672
1994	86.99463700234192
1995	91.47953091684435
1996	93.59260550458714
1997	92.79620503597123
1998	90.7233564013841
1999	92.81079646017699
2000	89.66016483516484
2001	91.26755555555555
2002	90.0155408388521
2003	88.12233853006683
2004	93.48835164835164
2005	97.53813308687616
2006	96.68598736176935
2007	93.83758974358975
2008	100.4048258064516
2009	96.62329856584093
2010	92.6676592356688
2011	93.62655716162944
2012	95.54859154929576
2013	95.86016304347827
2014	95.90615384615384
2015	94.59635811836115
2016	96.08326186830016