Annual % of total
1960 0
1961 0
1962 0
1963 2.7479091995221023
1964 2.396259497369959
1965 2.4475524475524475
1966 2.5116822429906542
1967 3.234649122807018
1968 13.930605903676852
1969 22.750511247443765
1970 25.436046511627907
1971 21.11378205128205
1972 19.65317919075144
1973 24.352941176470587
1974 23.811188811188806
1975 38.72155287817939
1976 27.295197740112993
1977 31.10454377539712
1978 26.915041782729805
1979 58.350357507660874
1980 65.98544232922733
1981 74.28001140575991
1982 71.71267438409023
1983 73.60885128538888
1984 63.60392506690455
1985 69.46497191841561
1986 81.10865968008825
1987 78.95408163265306
1988 79.86474023977867
1989 80.49654466342463
1990 71.02984848484849
1991 98.4894455852156
1992 150.35199591280653
1993 167.41784377017433
1994 159.58784000000003
1995 152.36794359576967
1996 146.94616973757678
1997 144.56841131105398
1998 96.2829793368573
1999 97.6109063180828
2000 111.86628163828809
2001 104.84279267773519
2002 90.62538768115942
2003 92.74681425112418
2004 102.9885741146976
2005 77.13314195736434
2006 80.29409293019121
2007 81.29893437806072
2008 75.3185732391816
2009 78.30459331817387
2010 85.81851774530271
2011 101.4683487912422
2012 111.52103015418203
2013 92.68268766756033
2014 121.88214054726367
2015 119.47791141519626
2016 112.74047021575986