| Jahr | Monat | Sichtungen |
|---|---|---|
| 2018 | 8 | 1 |
| 2013 | 10 | 1 |
| 2013 | 3 | 1 |
| 2012 | 2 | 2 |
| 2012 | 1 | 48 |
| 2011 | 12 | 201 
|
| 2011 | 11 | 137 |
| 2011 | 10 | 43 |
| 2011 | 9 | 19 |
| 2011 | 8 | 12 |
| 2011 | 7 | 6 |
| 2011 | 6 | 3 |
| 2011 | 5 | 1 |
| 2011 | 4 | 1 |
| 2011 | 3 | 3 |
| 2011 | 1 | 15 |
| 2010 | 10 | 3 |
| 2010 | 9 | 4 |
| 2010 | 8 | 9 |
| 2010 | 7 | 7 |
| 2010 | 6 | 3 |
| 2010 | 5 | 4 |
| 2010 | 4 | 2 |
| 2010 | 3 | 31 |
| Durchschnitt | 23 | |
| Total | 557 | |