| Jahr | Monat | Sichtungen |
|---|---|---|
| 2020 | 3 | 1 |
| 2019 | 4 | 1 |
| 2018 | 12 | 1 |
| 2017 | 11 | 1 |
| 2016 | 11 | 1 |
| 2016 | 9 | 1 |
| 2016 | 1 | 2 |
| 2015 | 10 | 1 |
| 2015 | 9 | 1 |
| 2015 | 8 | 1 |
| 2015 | 7 | 1 |
| 2015 | 6 | 2 |
| 2015 | 5 | 3 |
| 2015 | 4 | 4 |
| 2015 | 3 | 1 |
| 2015 | 2 | 4 |
| 2015 | 1 | 4 |
| 2014 | 11 | 1 |
| 2014 | 10 | 2 |
| 2014 | 9 | 5 |
| 2014 | 8 | 4 |
| 2014 | 6 | 1 |
| 2014 | 5 | 2 |
| 2014 | 4 | 4 |
| 2014 | 3 | 1 |
| 2014 | 2 | 31 |
| 2014 | 1 | 50 
|
| 2013 | 12 | 40 |
| Durchschnitt | 6 | |
| Total | 171 | |