分面浏览：发表日期 |
| 当前检索式 | ((ALL：observational)) |
| 限定条件 | 无 |
| 2024 18 | 2023 46 | 2022 69 |
| 2021 107 | 2020 115 | 2019 341 |
| 2018 413 | 2017 345 | 2016 351 |
| 2015 292 | 2014 270 | 2013 196 |
| 2012 197 | 2011 146 | 2010 179 |
| 2009 123 | 2008 116 | 2007 116 |
| 2006 67 | 2005 62 | 2004 68 |
| 2003 58 | 2002 63 | 2001 42 |
| 2000 31 | 1999 20 | 1998 17 |
| 1997 13 | 1996 11 | 1995 4 |
| 1994 9 | 1993 9 | 1992 8 |
| 1991 8 | 1990 4 | 1988 1 |
| 1986 2 | 1984 3 | 1983 1 |
