分面浏览：发表日期 |
| 当前检索式 | ((ALL：activity)) |
| 限定条件 | ((专题：北京大学)) |
| 2017 271 | 2016 310 | 2015 263 |
| 2014 254 | 2013 255 | 2012 200 |
| 2011 178 | 2010 165 | 2009 160 |
| 2008 157 | 2007 127 | 2006 104 |
| 2005 114 | 2004 106 | 2003 105 |
| 2002 95 | 2001 89 | 2000 57 |
| 1999 67 | 1998 62 | 1997 36 |
| 1996 20 | 1995 23 | 1994 13 |
| 1993 9 | 1992 8 | 1991 8 |
| 1990 7 | 1989 5 | 1988 8 |
| 1987 7 | 1986 7 | 1985 7 |
| 1984 3 | 1983 4 | 1982 2 |
| 1980 1 | 1979 2 | 1974 1 |
