| Jahr | Monat | Sichtungen |
|---|---|---|
| 2015 | 10 | 1 |
| 2015 | 9 | 2 |
| 2015 | 7 | 2 |
| 2015 | 6 | 2 |
| 2015 | 5 | 2 |
| 2014 | 11 | 2 |
| 2014 | 8 | 1 |
| 2014 | 6 | 3 |
| 2014 | 4 | 8 |
| 2014 | 3 | 5 |
| 2014 | 2 | 15 |
| 2014 | 1 | 13 |
| 2013 | 12 | 4 |
| 2013 | 11 | 4 |
| 2013 | 10 | 8 |
| 2013 | 9 | 8 |
| 2013 | 8 | 8 |
| 2013 | 7 | 3 |
| 2013 | 6 | 8 |
| 2013 | 5 | 5 |
| 2013 | 4 | 1 |
| 2013 | 3 | 4 |
| 2013 | 2 | 1 |
| 2013 | 1 | 2 |
| 2012 | 12 | 12 |
| 2012 | 11 | 5 |
| 2012 | 10 | 6 |
| 2012 | 9 | 1 |
| 2012 | 8 | 6 |
| 2012 | 7 | 5 |
| 2012 | 6 | 4 |
| 2012 | 5 | 6 |
| 2012 | 4 | 4 |
| 2012 | 3 | 4 |
| 2012 | 2 | 15 |
| 2012 | 1 | 23 |
| 2011 | 12 | 15 |
| 2011 | 11 | 36 |
| 2011 | 10 | 43 
|
| 2011 | 9 | 35 |
| 2011 | 8 | 21 |
| 2011 | 7 | 21 |
| 2011 | 6 | 22 |
| 2011 | 5 | 16 |
| 2011 | 4 | 14 |
| 2011 | 3 | 20 |
| 2011 | 2 | 20 |
| 2011 | 1 | 10 |
| 2010 | 12 | 13 |
| 2010 | 11 | 27 |
| 2010 | 10 | 16 |
| Durchschnitt | 10 | |
| Total | 532 | |