| 2012 | March | June | September | December |
| 2011 | March | June | September | December |
| 2010 | March | June | September | December |
| 2009 | March | June | September | December |
| 2008 | March | June | September | December |
| 2007 | March | June | September | December |
| 2006 | February | June | September | December |
| 2005 | March | June | September | December |
| 2004 | March | June | September | December |
| 2003 | March | June | September | December |
| 2002 | March | June | September | December |
| 2001 | March | June | September | December |
| 2000 | February | June | October | |
| 1999 | February | June | October | |
| 1998 | February | June | October | |
| 1997 | January | April | July | October |
| 1996 | February | June | October | |
| 1995 | February | June | October | |
| 1994 | February | June | October | |
| 1993 | February | June | October | |
| 1992 | February | June | October | |
| 1991 | February | July | October | |
| 1990 | February | June | October | |
| 1989 | July | November |