Annual % of total
1960 0
1961 0
1962 0
1963 7.975460122699387
1964 5.963302752293578
1965 7.761194029850746
1966 17.51412429378531
1967 11.313868613138686
1968 46.84385382059801
1969 46.68587896253602
1970 25.884016973125885
1971 32.20747889022919
1972 58.964143426294825
1973 55.71049136786188
1974 70.21709633649932
1975 69.40726577437857
1976 63.63636363636363
1977 60.824742268041234
1978 64.25873465533523
1979 66.36609558160504
1980 70.99023709902372
1981 66.27956989247312
1982 63.175549757733876
1983 79.76827094474153
1984 73.99442453205894
1985 80.89928057553956
1986 85.21478521478521
1987 78.69746551170998
1988 78.956888754899
1989 85.28584817244611
1990 97.41108938547485
1991 96.08602898550726
1992 81.05056234718828
1993 95.78529456771233
1994 91.71614061331339
1995 96.41447562776958
1996 95.02628087508822
1997 100.5754854368932
1998 98.5668794326241
1999 102.53359223300971
2000 101.74308564231738
2001 72.95965222696766
2002 73.127049941928
2003 72.29870267260578
2004 75.32382041271612
2005 69.10612077294687
2006 69.1514711111111
2007 90.75864841373316
2008 92.80752119499394
2009 97.83609381318237
2010 94.51205542725172
2011 93.37255474452554
2012 91.8889198343997
2013 91.10123435326844
2014 93.89558570483123
2015 92.35806862745098
2016 90.04792052980133