Year	% of total
1960	92.15017064846415
1961	90.9090909090909
1962	90.27459954233409
1963	90.35532994923858
1964	92.52728799328295
1965	90.5284147557328
1966	93.51230425055928
1967	93.39697692919651
1968	92.25092250922509
1969	90.78481012658227
1970	87.77533039647578
1971	90.38382170862566
1972	88.76298394711992
1973	89.96748722712495
1974	91.38846737481032
1975	91.90163934426229
1976	89.2324093816631
1977	88.84721180295074
1978	88.12334377258492
1979	92.27516669377134
1980	91.43310417768376
1981	92.09801762114537
1982	90.79065588499552
1983	90.11147540983606
1984	90.55851063829786
1985	89.43853574078653
1986	90.4561403508772
1987	80.33201741066911
1988	81.3498759305211
1989	79.38680246127731
1990	96.05878254988163
1991	100.06307692307692
1992	100.0016592356688
1993	106.55281534460339
1994	103.10849435382686
1995	96.29548530721283
1996	90.27534365661505
1997	87.82045491251682
1998	86.22256928838952
1999	91.80569755600814
2000	88.21022767518339
2001	83.13346489104117
2002	54.738642533936655
2003	89.0730605487228
2004	76.13867278424351
2005	63.78337589928058
2006	65.06229134795173
2007	82.71410817772055
2008	82.67636746799874
2009	76.44542089249492
2010	66.79222445561139
2011	68.04147353361945
2012	63.062193955207654
2013	77.24361939076319
2014	70.4139859623199
2015	72.04443932411674
2016	74.65657218442932