Annual % of total
1960 94.38669438669439
1961 93.31848552338529
1962 93.20843091334893
1963 92.85714285714286
1964 93.33333333333333
1965 92.914653784219
1966 92.27272727272728
1967 92.5035360678925
1968 92
1969 82.6530612244898
1970 81.07876712328768
1971 86.8923611111111
1972 86.99122106943335
1973 81.3937282229965
1974 83.44370860927154
1975 86.90239043824701
1976 87.56781193490055
1977 85.15433610975013
1978 88.21667252901862
1979 87.43218806509945
1980 88.29787234042553
1981 90.92706502636203
1982 91.27376425855515
1983 91.69323082692668
1984 91.18509573917544
1985 88.60162294772597
1986 83.77340374459914
1987 88.01552644347404
1988 84.67091295116772
1989 84.40383571557808
1990 86.69164102564103
1991 82.643650990099
1992 112.43904125508423
1993 130.95779429987607
1994 62.57370522607164
1995 99.01641557128413
1996 92.84080924855492
1997 64.82259447983014
1998 82.5310265183918
1999 89.25039092664093
2000 81.14760411792231
2001 83.97148163962424
2002 90.0816659601526
2003 95.54708263772955
2004 97.08461841070024
2005 95.85524493554328
2006 84.38760906904844
2007 92.45600405679514
2008 95.33231175693527
2009 95.02765340733889
2010 90.1351774891775
2011 84.71286478873239
2012 70.51692055692055
2013 87.21563783920871
2014 92.66295388349515
2015 89.30657907662084
2016 87.81623686234299