| Jahr | Monat | Sichtungen |
|---|---|---|
| 2015 | 9 | 2 |
| 2014 | 9 | 3 |
| 2014 | 8 | 3 |
| 2014 | 7 | 2 |
| 2014 | 6 | 1 |
| 2013 | 10 | 2 |
| 2013 | 9 | 5 |
| 2013 | 8 | 2 |
| 2013 | 6 | 1 |
| 2013 | 5 | 49 
|
| 2013 | 4 | 8 |
| 2013 | 3 | 14 |
| 2013 | 2 | 1 |
| 2013 | 1 | 2 |
| 2012 | 12 | 1 |
| 2012 | 11 | 4 |
| 2012 | 10 | 6 |
| 2012 | 9 | 5 |
| 2012 | 8 | 3 |
| 2012 | 7 | 5 |
| 2012 | 6 | 7 |
| 2012 | 5 | 3 |
| 2012 | 4 | 8 |
| 2012 | 3 | 8 |
| 2012 | 2 | 1 |
| 2012 | 1 | 5 |
| 2011 | 12 | 1 |
| 2011 | 11 | 2 |
| 2011 | 8 | 4 |
| 2011 | 7 | 34 |
| Durchschnitt | 6 | |
| Total | 192 | |