Species: Common rat (Rattus norvegicus)
| Year | Arter/grupper | Localities | Participants | Observations |
|---|---|---|---|---|
| 2024 | 1 | 37 | 37 | 39 |
| 2023 | 1 | 39 | 39 | 43 |
| 2022 | 1 | 60 | 60 | 61 |
| 2021 | 1 | 70 | 70 | 72 |
| 2020 | 1 | 32 | 32 | 32 |
| 2019 | 1 | 17 | 17 | 17 |
| 2018 | 1 | 29 | 29 | 29 |
| 2017 | 1 | 20 | 20 | 20 |
| 2016 | 1 | 13 | 12 | 15 |
| 2015 | 1 | 14 | 14 | 14 |
| 2014 | 1 | 7 | 7 | 9 |
| 2013 | 1 | 10 | 10 | 10 |
| 2009 | 1 | 1 | 1 | 1 |
| 2007 | 1 | 1 | 1 | 1 |
| 2005 | 1 | 2 | 2 | 2 |
| 2004 | 1 | 2 | 2 | 2 |
| 2003 | 1 | 1 | 1 | 2 |
| 2002 | 1 | 2 | 2 | 2 |
| 2001 | 1 | 1 | 1 | 1 |
| 2000 | 1 | 1 | 1 | 1 |
| 1999 | 1 | 6 | 5 | 7 |
| 1998 | 1 | 12 | 11 | 19 |
| 1997 | 1 | 10 | 10 | 16 |
| 1996 | 1 | 23 | 23 | 28 |
| 1995 | 1 | 26 | 26 | 39 |
| 1994 | 1 | 14 | 12 | 16 |
| 1993 | 1 | 19 | 17 | 23 |
| 1989 | 1 | 1 | 1 | 1 |
| Totalt alle år | 1 | 362 | 353 | 522 |
