Annual % 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