IR@PKUHSC
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1998 1904 1997 1912 1996 1672
1995 1614 1994 1528 1993 952
1992 751 1991 751 1990 670
1989 745 1988 649 1987 543
1986 419 1985 117 1983 1
1982 3 1981 1 1980 3
1978 1 1965 3