Species: Silver birch (Betula pendula)
| Year | Arter/grupper | Localities | Participants | Observations |
|---|---|---|---|---|
| 2024 | 1 | 1 | 1 | 2 |
| 2022 | 3 | 13 | 11 | 32 |
| 2021 | 2 | 4 | 2 | 4 |
| 2020 | 1 | 1 | 1 | 1 |
| 2014 | 2 | 2 | 2 | 2 |
| 2013 | 1 | 2 | 2 | 2 |
| 2011 | 1 | 2 | 2 | 3 |
| 2010 | 1 | 1 | 1 | 2 |
| 2008 | 1 | 1 | 1 | 2 |
| 2007 | 1 | 2 | 2 | 4 |
| Totalt alle år | 3 | 27 | 23 | 54 |
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