IHB OpenIR
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1999 297 1998 229 1997 223
1996 217 1995 164 1994 135
1993 116 1992 121 1991 119
1990 113 1989 111 1988 104
1987 90 1986 109 1985 99
1984 77 1983 54 1982 67
1981 52 1980 53