Annual % of total
1960 89.82300884955751
1961 88.73873873873875
1962 88.73873873873875
1963 88.93617021276596
1964 88.8888888888889
1965 94.58874458874459
1966 94.45628997867803
1967 87.95811518324608
1968 222.72727272727272
1969 79.10447761194031
1970 90.75630252100841
1971 91.0569105691057
1972 88.41309823677582
1973 90.54373522458629
1974 91.08910891089108
1975 93.03977272727273
1976 89.25619834710744
1977 92.64705882352939
1978 93.16596931659693
1979 93.42604298356511
1980 94.20131291028446
1981 94.32703003337042
1982 94.11764705882352
1983 92.47910863509749
1984 94.23503325942349
1985 92.46575342465754
1986 93.11294765840219
1987 92.37668161434979
1988 92.37967914438502
1989 94.44444444444446
1990 126.06296137339055
1991 135.97802575107295
1992 123.56505836575874
1993 130.98524
1994 134.87816091954022
1995 110.80717391304347
1996 111.01122866894198
1997 86.93417445482866
1998 80.36841666666666
1999 80.56287878787879
2000 80.56561576354679
2001 80.01476404494382
2002 74.46091703056769
2003 85.26387527839644
2004 67.62519480519481
2005 72.43456790123457
2006 50.69281867145422
2007 46.42895161290323
2008 45.894796875
2009 34.464285714285715
2010 71.04486486486486
2011 66.75199471598415
2012 63.01734584450402
2013 61.62024968789014
2014 66.87889148191366
2015 73.97224137931035
2016 68.86714717741935