| 2007 | 2008 | 2009 | 2010 | 2011 | 2012 |
| July | January | January | No January | January | January |
| August | February | February | February | February | |
| September | March | March | March | March | |
| October | April | April | April | April | |
| November | May | May | May | May | |
| December | June | June | June | June | |
| July | July | July | July | ||
| August | August | No August | No August | ||
| September | September | September | September | ||
| October | October | No October | October | ||
| November | November | November | November | ||
| December | December | December | No December |