| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 |
| May | January | January | January | January | January |
| June | February | February | February | February | February |
| July | March | March | March | March | March |
| August | April | April | April | April | April |
| September | May | May | May | May | May |
| October | June | June | June | June | June |
| November | July | July | July | July | July |
| December | August | August | August | August | August |
| September | September | September | September | September | |
| October | October | October | October | October | |
| November | November | November | November | November | |
| December | December | December | December | December | |
| 2005 | 2006 | 2007 | 2008 | ||
| January | January | January | January | ||
| February | February | February | February | ||
| March | March | March | March | ||
| April | April | April | April | ||
| May | May | May | |||
| June | June | June | |||
| July | July | July | |||
| August | August | August | |||
| September | September | September | |||
| October | October | October | |||
| November | November | ||||
| December | December | December |