| Jahr | Monat | Sichtungen |
|---|---|---|
| 2023 | 3 | 4 
|
| 2022 | 11 | 1 |
| 2022 | 3 | 1 |
| 2021 | 5 | 1 |
| 2020 | 12 | 1 |
| 2017 | 11 | 1 |
| 2016 | 6 | 1 |
| 2016 | 4 | 2 |
| 2015 | 9 | 1 |
| 2015 | 5 | 3 |
| 2015 | 1 | 1 |
| 2014 | 11 | 1 |
| 2014 | 3 | 1 |
| 2013 | 12 | 1 |
| 2013 | 8 | 1 |
| 2013 | 6 | 1 |
| 2012 | 12 | 2 |
| 2012 | 7 | 1 |
| 2012 | 3 | 1 |
| 2012 | 2 | 2 |
| 2012 | 1 | 1 |
| 2011 | 10 | 1 |
| Durchschnitt | 1 | |
| Total | 30 | |