Year Number 1961 27124 1962 28065 1963 28724 1964 29412 1965 30569 1966 34316 1967 38524 1968 40438 1969 46242 1970 50692 1971 53433 1972 61135 1973 61325 1974 65537 1975 68385 1976 82216 1977 96308 1978 110649 1979 124236 1980 135528 1981 150623 1982 161429 1983 181153 1984 199675 1985 200264 1986 223140 1987 245537 1988 268867 1989 292394 1990 315703 1991 323508 1992 335869 1993 322018 1994 308060 1995 361492 1996 378139 1997 390804 1998 378696 1999 389938