| 2012 | 2011 | 2010 | 2009 | ||
| January | Volume 32 No 4 | Volume 31 No 4 | Volume 30 No 4 | Volume 29 No 4 | |
| February | Volume 31 No 5 | Volume 30 No 5 | Volume 29 No 5 | ||
| March | Volume 31 No 6 | Volume 30 No 6 | Volume 29 No 6 | ||
| April | Volume 31 No 7 | Volume 30 No 7 | Volume 29 No 7 | ||
| May | Volume 31 No 8 | Volume 30 No 8 | Volume 29 No 8 | ||
| June | Volume 31 No 9 | Volume 30 No 9 | Volume 29 No 9 | ||
| July | Volume 31 No 10 | Volume 30 No 10 | Volume 29 No 10 | ||
| August | Volume 31 No 11 | Volume 30 No 11 | Volume 29 No 11 | ||
| September | Volume 31 No 12 | Volume 30 No 12 | Volume 29 No 12 | ||
| October | Volume 32 No 1 | Volume 31 No 1 | Volume 30 No 1 | ||
| November | Volume 32 No 2 | Volume 31 No 2 | Volume 30 No 2 | ||
| December | Volume 32 No 3 | Volume 31 No 3 |
Volume
30 No 3 Volume 30 No 3a |