Year Number 1961 120000 1962 130000 1963 140000 1964 150000 1965 155000 1966 160000 1967 165000 1968 170000 1969 175000 1970 168350 1971 171000 1972 174660 1973 180000 1974 180000 1975 180000 1976 180000 1977 180000 1978 173000 1979 171400 1980 166700 1981 213000 1982 203700 1983 201800 1984 203700 1985 204000 1986 225000 1987 245000 1988 267782 1989 266100 1990 264500 1991 262850 1992 261200 1993 259500 1994 257800 1995 256100 1996 254400 1997 252700 1998 251000 1999 249300 2000 247600 2001 245900 2002 244320