| Epoch | 
[deg] |
![$\rho ['']$](/articles/aa/full/2003/28/aah4391/img45.gif){kind=small} |
| 2003.0 | 351.9 | 0.485 |
| 2004.0 | 8.5 | 0.521 |
| 2005.0 | 24.2 | 0.517 |
| 2006.0 | 41.1 | 0.489 |
| 2007.0 | 60.3 | 0.455 |
| 2008.0 | 82.1 | 0.435 |
| 2009.0 | 104.7 | 0.441 |
| 2010.0 | 125.5 | 0.469 |
| 2011.0 | 143.4 | 0.506 |
| 2012.0 | 159.2 | 0.531 |
| 2013.0 | 174.3 | 0.527 |
| 2014.0 | 190.8 | 0.483 |
| 2015.0 | 212.7 | 0.400 |