分面浏览：发表日期 |
| 当前检索式 | ((ALL：Field observations)) |
| 限定条件 | 无 |
| 2024 22 | 2023 60 | 2022 97 |
| 2021 143 | 2020 168 | 2019 315 |
| 2018 401 | 2017 429 | 2016 392 |
| 2015 334 | 2014 378 | 2013 280 |
| 2012 245 | 2011 210 | 2010 272 |
| 2009 176 | 2008 196 | 2007 143 |
| 2006 124 | 2005 138 | 2004 69 |
| 2003 65 | 2002 63 | 2001 66 |
| 2000 31 | 1999 27 | 1998 16 |
| 1997 14 | 1996 13 | 1995 10 |
| 1994 11 | 1993 11 | 1992 5 |
| 1991 14 | 1990 4 | 1988 1 |
| 1987 2 | 1986 2 | 1985 1 |
| 1984 1 | 1983 2 | 1905 1 |
