| Jahr | Monat | Sichtungen |
|---|---|---|
| 2012 | 11 | 12 |
| 2012 | 5 | 1 |
| 2011 | 12 | 9 |
| 2011 | 10 | 1 |
| 2011 | 6 | 1 |
| 2011 | 5 | 2 |
| 2011 | 3 | 1 |
| 2011 | 1 | 2 |
| 2010 | 12 | 1 |
| 2010 | 10 | 1 |
| 2010 | 9 | 2 |
| 2010 | 8 | 3 |
| 2010 | 7 | 14 |
| 2010 | 6 | 4 |
| 2010 | 5 | 1 |
| 2009 | 6 | 334 |
| 2009 | 5 | 178 |
| 2009 | 4 | 381 |
| 2009 | 3 | 312 |
| 2009 | 2 | 307 |
| 2009 | 1 | 191 |
| 2008 | 12 | 331 |
| 2008 | 11 | 352 |
| 2008 | 10 | 399 |
| 2008 | 9 | 454 |
| 2008 | 8 | 296 |
| 2008 | 7 | 264 |
| 2008 | 6 | 512 
|
| 2008 | 5 | 218 |
| Durchschnitt | 158 | |
| Total | 4584 | |