Year Number 1961 44042 1962 47877 1963 51743 1964 57547 1965 63333 1966 66979 1967 71651 1968 76490 1969 84118 1970 91487 1971 93943 1972 103239 1973 109796 1974 115089 1975 128540 1976 137432 1977 145108 1978 119308 1979 125286 1980 133863 1981 142888 1982 152688 1983 161741 1984 165595 1985 174941 1986 182932 1987 187960 1988 193776 1989 199810 1990 208426 1991 211970 1992 264611 1993 268043 1994 274558 1995 292986 1996 293614 1997 298100