1970 1,500 1971 12,000 1979 12,000 1981 18,000 1982 25,000 1983 30,000 1984 35,000 1985 40,000 1986 40,000 1987 50,000 1989 65,000 1990 70,000 1992 70,000 1993 80,000 1994 80,000 1995 80,000 1997 95,000 1998 102,500 1999 102,500