Year | Value | 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 | 120,300 | 1990 | 130,300 | 1989 | 128,000 | 1988 | 123,700 | 1987 | 122,100 | 1986 | 128,400 | 1985 | 123,500 | 1984 | 117,700 | 1983 | 114,400 | 1982 | 112,300 | 1981 | 129,100 | 1980 | 136,100 | 1979 | 122,300 | 1978 | 117,200 | 1977 | 103,400 | 1976 | 98,400 | 1975 | 88,000 | 1974 | 79,500 | 1973 | 74,100 | 1972 | 68,900 | 1971 | 71,800 | 1970 | 69,500 |
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