Annual % 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