| Jahr | Monat | Sichtungen |
|---|---|---|
| 2016 | 3 | 1 |
| 2014 | 11 | 1 |
| 2014 | 10 | 2 |
| 2014 | 9 | 1 |
| 2014 | 1 | 1 |
| 2013 | 12 | 1 |
| 2013 | 11 | 6 |
| 2013 | 10 | 10 |
| 2013 | 9 | 1 |
| 2013 | 8 | 1 |
| 2013 | 6 | 1 |
| 2013 | 5 | 5 |
| 2013 | 4 | 2 |
| 2013 | 3 | 4 |
| 2013 | 2 | 1 |
| 2013 | 1 | 6 |
| 2012 | 12 | 17 |
| 2012 | 11 | 6 |
| 2012 | 10 | 5 |
| 2012 | 9 | 5 |
| 2012 | 8 | 3 |
| 2011 | 5 | 15 |
| 2011 | 4 | 6 |
| 2011 | 3 | 4 |
| 2011 | 2 | 2 |
| 2011 | 1 | 2 |
| 2010 | 12 | 8 |
| 2010 | 11 | 5 |
| 2010 | 10 | 1 |
| 2010 | 9 | 4 |
| 2010 | 7 | 4 |
| 2010 | 6 | 3 |
| 2010 | 5 | 16 |
| 2010 | 4 | 52 
|
| Durchschnitt | 6 | |
| Total | 202 | |