• 1976 to 1976 8
• 1977 to 1979 90
• 1980 to 1981 87
• 1982 to 1984 203
• 1985 to 1986 162
• 1987 to 1989 122
• 1990 to 1991 58
• 1992 to 1994 54
• 1995 to 1996 13
• 1997 to 1999 4