| Jahr | Monat | Sichtungen |
|---|---|---|
| 2023 | 1 | 1 |
| 2022 | 1 | 11 |
| 2020 | 6 | 1 |
| 2019 | 3 | 1 |
| 2016 | 2 | 17 |
| 2016 | 1 | 130 
|
| 2015 | 11 | 5 |
| 2015 | 7 | 1 |
| 2012 | 1 | 4 |
| 2011 | 11 | 6 |
| 2011 | 10 | 67 |
| 2011 | 9 | 43 |
| 2011 | 8 | 88 |
| 2011 | 7 | 12 |
| 2011 | 6 | 15 |
| 2011 | 5 | 9 |
| 2011 | 4 | 7 |
| 2011 | 3 | 14 |
| 2011 | 2 | 14 |
| 2011 | 1 | 3 |
| 2010 | 11 | 1 |
| 2010 | 10 | 8 |
| 2010 | 9 | 5 |
| 2010 | 8 | 7 |
| 2010 | 7 | 7 |
| 2010 | 6 | 9 |
| 2010 | 5 | 11 |
| 2010 | 4 | 16 |
| 2010 | 3 | 15 |
| Durchschnitt | 18 | |
| Total | 528 | |