| 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 |
|---|---|---|---|---|---|---|
| January | January | January | January | January | January | |
| March | March | March | March | March | March | |
| June | June | June | June | June | June | June |
| September | September | September | September | September | September | October |
| November | November | November | November | November | November | December |