| YEAR | ISSUES | |||||
| 2013 | February | April | ||||
| 2012 | February | July | August | November | ||
| 2011 | January | May | September | November | ||
| 2010 | January | June | July | September | ||
| 2009 | January | March | May | July | September | December |
| 2008 | January | March | July | September | November | |
| 2007 | January | June | July | September | ||
| 2006 | January | March | May | July | September | November |
| 2005 | January | March | July | September | ||
| 2004 | January | March | July | September |