| Jahr | Monat | Sichtungen |
|---|---|---|
| 2016 | 3 | 2 |
| 2015 | 4 | 1 |
| 2015 | 3 | 5 |
| 2015 | 1 | 1 |
| 2014 | 10 | 1 |
| 2014 | 1 | 139 |
| 2013 | 9 | 181 |
| 2013 | 8 | 114 |
| 2013 | 7 | 222 |
| 2013 | 6 | 405 |
| 2013 | 5 | 1246 |
| 2013 | 4 | 895 |
| 2013 | 3 | 1084 |
| 2013 | 2 | 1646 |
| 2013 | 1 | 1999 |
| 2012 | 12 | 1279 |
| 2012 | 11 | 1666 |
| 2012 | 10 | 1699 |
| 2012 | 9 | 1756 |
| 2012 | 8 | 2323 |
| 2012 | 7 | 2592 
|
| 2012 | 6 | 1595 |
| 2012 | 5 | 1479 |
| 2012 | 4 | 1048 |
| 2012 | 3 | 1083 |
| 2012 | 2 | 1748 |
| 2012 | 1 | 1401 |
| 2011 | 12 | 2001 |
| 2011 | 11 | 1785 |
| 2011 | 10 | 1001 |
| 2011 | 9 | 180 |
| 2011 | 8 | 99 |
| Durchschnitt | 1021 | |
| Total | 32676 | |
