| Jahr | Monat | Sichtungen |
|---|---|---|
| 2020 | 2 | 1 |
| 2019 | 8 | 3 |
| 2018 | 12 | 4 |
| 2018 | 9 | 13 |
| 2018 | 8 | 1 |
| 2018 | 7 | 6 |
| 2017 | 2 | 20 |
| 2017 | 1 | 25 |
| 2016 | 12 | 1 |
| 2016 | 11 | 85 |
| 2016 | 10 | 93 
|
| 2016 | 9 | 48 |
| 2016 | 8 | 42 |
| 2016 | 7 | 30 |
| 2016 | 6 | 43 |
| 2016 | 5 | 1 |
| 2016 | 4 | 42 |
| 2016 | 3 | 3 |
| 2016 | 2 | 5 |
| 2016 | 1 | 4 |
| 2015 | 12 | 4 |
| 2015 | 10 | 4 |
| 2015 | 9 | 1 |
| 2015 | 8 | 2 |
| 2015 | 7 | 2 |
| Durchschnitt | 19 | |
| Total | 483 | |