Year | Value | 2021 | 15,019.2 | 2017 | 14,713 | 2016 | 15,044 | 2015 | 15,243 | 2014 | 13,227.5 | 2013 | 87,936 | 2012 | 119,652 | 2001 | 46,364 | 2000 | 77,273 | 1999 | 83,900 | 1998 | 90,500 | 1997 | 85,500 | 1996 | 75,100 | 1995 | 74,100 | 1994 | 69,200 | 1993 | 68,200 | 1992 | 66,300 | 1991 | 66,300 | 1990 | 76,300 | 1989 | 74,000 | 1988 | 111,300 | 1987 | 111,700 | 1986 | 120,000 | 1985 | 73,500 | 1984 | 117,700 | 1983 | 117,500 | 1982 | 116,300 | 1981 | 114,100 | 1980 | 111,100 | 1979 | 99,300 | 1978 | 94,200 | 1977 | 83,400 | 1976 | 75,400 | 1975 | 69,000 | 1974 | 63,500 | 1973 | 57,600 | 1972 | 52,900 | 1971 | 56,700 | 1970 | 54,700 |
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