Annual % of total
1960 23.151750972762645
1961 38.99721448467967
1962 18.81918819188192
1963 13.024282560706402
1964 33.04794520547946
1965 31.261425959780624
1966 40
1967 34.05088062622309
1968 41.556728232189975
1969 44.68325791855203
1970 41.646191646191646
1971 48.275862068965516
1972 49.66666666666666
1973 47.73662551440329
1974 45.16880093131548
1975 47.64930114358323
1976 43.98280802292264
1977 63.378378378378386
1978 71.5561224489796
1979 71.70596393897364
1980 72.57142857142857
1981 64.06480117820324
1982 67.67676767676768
1983 65.12059369202227
1984 63.72315035799523
1985 66.77316293929712
1986 78.35820895522389
1987 79.47761194029852
1988 79.71014492753623
1989 80.28169014084506
1990 73.99482142857143
1991 86.99372340425532
1992 75.67354545454546
1993 70.49736434108527
1994 79.67390909090909
1995 79.92179487179487
1996 82.19137931034483
1997 78.74100775193799
1998 82.80322580645161
1999 87.94837398373984
2000 84.8795104895105
2001 102.46794326241135
2002 85.01834394904458
2003 84.47539267015706
2004 85.81931937172774
2005 84.06222222222222
2006 81.62032258064515
2007 82.54860986547085
2008 78.08745535714287
2009 78.30725099601594
2010 77.7889338235294
2011 75.8610625
2012 75.4900325732899
2013 91.35705202312138
2014 123.62794183445189
2015 62.417021276595754
2016 97.15333333333334