Year	% of total
1960	97.69807280513918
1961	92.98615291992776
1962	96.37681159420289
1963	95.47244094488188
1964	95.51051821446896
1965	95.60742971887551
1966	96.25694276744747
1967	98.44004656577415
1968	96.61559570089184
1969	96.68578712555768
1970	97.09347996857815
1971	97.3630072938096
1972	95.75105782792666
1973	96.00523903077931
1974	95.34250960307298
1975	95.48841620376642
1976	94.80064655172414
1977	94.58717884759291
1978	94.74250209105031
1979	95.14338575393154
1980	94.59301646619176
1981	94.14399283394917
1982	94.3754642895044
1983	93.96029009630247
1984	94.05016308626702
1985	94.24808644754616
1986	94.27572645837886
1987	93.85462792958204
1988	94.04198394731426
1989	94.2027498460907
1990	87.12361197401864
1991	100.66536638716732
1992	90.3718786781349
1993	95.00614733698359
1994	95.16212864414622
1995	107.11834488734834
1996	104.53074310827006
1997	86.32171532846716
1998	86.53847866419294
1999	84.31596478620195
2000	85.39428723404254
2001	86.73216991541007
2002	93.37006933744222
2003	92.94674990091161
2004	91.52080096115338
2005	91.73172080433102
2006	89.52778326996199
2007	83.26247058823529
2008	94.14893576586849
2009	92.58160147601477
2010	102.96926305353603
2011	92.99840925017519
2012	93.01596533795494
2013	91.56103473491774
2014	91.23845238095238
2015	94.86978537650054
2016	88.76846748681898