Year | Value | 2004 | 254,045 | 2003 | 248,403 | 2002 | 270,045 | 2001 | 306,511 | 2000 | 320,753 | 1999 | 334,500 | 1998 | 305,100 | 1997 | 301,500 | 1996 | 279,500 | 1995 | 266,500 | 1994 | 259,200 | 1993 | 249,800 | 1992 | 253,700 | 1991 | 228,000 | 1990 | 233,500 | 1989 | 221,400 | 1988 | 222,600 | 1987 | 233,300 | 1986 | 229,900 | 1985 | 190,500 | 1984 | 177,100 | 1983 | 169,400 | 1982 | 161,100 | 1981 | 158,800 | 1980 | 171,100 | 1979 | 167,800 | 1978 | 150,000 | 1977 | 149,700 | 1976 | 141,700 | 1975 | 137,700 | 1974 | 126,900 | 1973 | 120,900 | 1972 | 110,700 | 1971 | 96,500 | 1970 | 83,600 |
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