| Year | Value | | 2021 | 7,512 | | 2020 | 17,990 | | 2019 | 28,697 | | 2018 | 26,069 | | 2012 | 247,780.34769101 | | 2011 | 340,267.62320722 | | 2010 | 273,160 | | 2001 | 47,800 | | 2000 | 73,256 | | 1999 | 70,400 | | 1998 | 125,500 | | 1997 | 126,000 | | 1996 | 126,000 | | 1995 | 121,100 | | 1994 | 115,300 | | 1993 | 115,300 | | 1992 | 115,300 | | 1991 | 111,900 | | 1990 | 145,700 | | 1989 | 143,000 | | 1988 | 135,200 | | 1987 | 128,500 | | 1986 | 122,500 | | 1985 | 104,000 | | 1984 | 100,000 | | 1983 | 93,000 | | 1982 | 93,000 | | 1981 | 81,500 | | 1980 | 27,500 | | 1979 | 27,500 | | 1978 | 27,000 | | 1977 | 27,000 | | 1976 | 26,000 | | 1975 | 24,000 | | 1974 | 22,000 | | 1973 | 20,000 | | 1972 | 19,000 | | 1971 | 18,700 | | 1970 | 17,800 |
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