Annual % of total
1960 99.47368421052632
1961 99.64973730297724
1962 96.30156472261737
1963 96.65587918015102
1964 96.73267326732673
1965 95.5072463768116
1966 68.47826086956522
1967 92.08633093525181
1968 94.45196211096075
1969 95.57251908396948
1970 97.94603302456706
1971 98.05524861878453
1972 97.6916735366859
1973 97.51166407465008
1974 97.52962777499583
1975 97.29568205587928
1976 97.71700647051642
1977 97.56476683937824
1978 97.92127377266698
1979 98.11186681555174
1980 96.86187587494166
1981 95.75252663206774
1982 95.46407001109331
1983 95.47359597652975
1984 95.72949829838622
1985 96.89454625260618
1986 97.36180904522612
1987 97.53655793025871
1988 97.66402600040627
1989 97.86395867985641
1990 146.33452220726784
1991 141.34767337807605
1992 144.49210689869483
1993 125.5042279903666
1994 144.73622833843015
1995 95.56081275720165
1996 112.9723030607125
1997 136.21744556962025
1998 116.3227612529613
1999 121.09583571614245
2000 107.38333255049317
2001 106.81753252898037
2002 97.87530577713319
2003 54.30460491889063
2004 41.2051590106007
2005 47.671
2006 45.80543718052193
2007 13.484293549229564
2008 54.74729828214472
2009 111.71931496265775
2010 98.49280122612592
2011 67.11502792048248
2012 72.76926070038911
2013 78.83382058287796
2014 76.2597435897436
2015 84.14757582417582
2016 34.342376516464476