Annual % of total
1960 88.07339449541286
1961 96.90721649484534
1962 94.44444444444444
1963 86.5079365079365
1964 87.87878787878789
1965 89.47368421052632
1966 88.60759493670886
1967 91.30434782608697
1968 90.36144578313254
1969 89.6551724137931
1970 90.56603773584906
1971 90.71428571428571
1972 93.16239316239316
1973 93.85665529010238
1974 94.44444444444446
1975 95.23809523809524
1976 90.40590405904058
1977 91.77489177489177
1978 93.5251798561151
1979 90.61488673139158
1980 93.87755102040816
1981 91.07142857142858
1982 90.61371841155234
1983 85.39325842696628
1984 95.78059071729959
1985 97.22222222222221
1986 94.2122186495177
1987 95.72649572649573
1988 94.31818181818181
1989 92.91338582677166
1990 98.06134831460675
1991 100.36
1992 96.25874999999999
1993 94.6086
1994 99.09991735537189
1995 91.0058394160584
1996 98.81305343511451
1997 111.04295774647888
1998 101.91110429447853
1999 106.49670658682635
2000 110.23224242424243
2001 101.00718562874252
2002 106.73589285714287
2003 101.72967741935483
2004 102.89824242424241
2005 94.99888888888889
2006 95.69975609756098
2007 95.9389534883721
2008 99.70943820224718
2009 98.50994082840236
2010 94.71449197860963
2011 86.56799086757991
2012 71.33251824817518
2013 65.83078498293516
2014 70.81518032786884
2015 74.44451807228916
2016 84.84208074534162