| Jahr | Monat | Sichtungen |
|---|---|---|
| 2016 | 12 | 1 |
| 2016 | 7 | 1 |
| 2016 | 4 | 2 |
| 2015 | 11 | 3 |
| 2015 | 9 | 1 |
| 2015 | 7 | 1 |
| 2015 | 6 | 2 |
| 2015 | 4 | 1 |
| 2015 | 1 | 2 |
| 2014 | 11 | 1 |
| 2014 | 9 | 1 |
| 2014 | 8 | 6 |
| 2014 | 7 | 2 |
| 2014 | 5 | 1 |
| 2014 | 4 | 1 |
| 2013 | 10 | 1 |
| 2013 | 9 | 1 |
| 2013 | 8 | 3 |
| 2013 | 6 | 2 |
| 2013 | 5 | 1 |
| 2013 | 3 | 1 |
| 2013 | 2 | 5 |
| 2013 | 1 | 1 |
| 2012 | 12 | 1 |
| 2012 | 11 | 2 |
| 2012 | 10 | 5 |
| 2012 | 9 | 4 |
| 2012 | 8 | 11 |
| 2012 | 7 | 5 |
| 2012 | 6 | 2 |
| 2012 | 5 | 1 |
| 2012 | 2 | 2 |
| 2012 | 1 | 2 |
| 2011 | 12 | 1 |
| 2011 | 10 | 1 |
| 2011 | 9 | 6 |
| 2011 | 8 | 3 |
| 2011 | 7 | 2 |
| 2011 | 6 | 2 |
| 2011 | 5 | 5 |
| 2011 | 4 | 1 |
| 2010 | 6 | 3 |
| 2010 | 5 | 12 
|
| 2010 | 4 | 10 |
| 2010 | 3 | 1 |
| Durchschnitt | 3 | |
| Total | 123 | |
