Swammerdamia
Observations/month
| Month | 2008–2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2023 | 2024 | total | |
|---|
| Januar | | | | | | | | | | | | | | | |
| Februar | | | | | | | | | | | | | | | |
| Mars | | | | | | | | | | | | | | | |
| April | | | | | | | | | | | | | | | |
| Mai | | | | | | | | | | | | | | | |
| Juni | 9 | 2 | 7 | 6 | 11 | 33 | 4 | 4 | 2 | 5 | 1 | | 1 | 53 % | |
| Juli | 11 | 12 | 6 | 8 | 18 | 6 | 5 | 2 | 1 | | | 1 | | 44 % | |
| August | | 2 | | | 1 | | 2 | | | | | | | 3 % | |
| September | | | | | | | | | | | | | | | |
| Oktober | | | | | | | | | | | | | | | |
| November | | | | | | | | | | | | | | | |
| Desember | | | | | | | | | | | | | | | |