| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| N/A | Jan | Jan | Jan | Jan | Jan | Jan | Jan | Jan | Jan | Jan | Jan |
| N/A | Feb | Feb | Feb | Feb | Feb | Feb | Feb | Feb | Feb | Feb | Feb |
| N/A | Mar | Mar | Mar | Mar | Mar | Mar | Mar | Mar | Mar | Mar | Mar |
| N/A | Apr | Apr | Apr | Apr | Apr | Apr | Apr | Apr | Apr | Apr | Apr |
| N/A | May | May | May | May | May | May | May | May | May | May | May |
| N/A | June | June | June | June | June | June | June | June | June | June | June |
| N/A | July | July | July | July | July | July | July | July | July | July | July |
| N/A | Aug | Aug | Aug | Aug | Aug | Aug | Aug | Aug | Aug | Aug | Aug |
| Sept | Sept | Sept | Sept | Sept | Sept | Sept | Sept | Sept | Sept | Sept | Sept |
| Oct | Oct | Oct | Oct | Oct | Oct | Oct | Oct | Oct | Oct | Oct | Oct |
| Nov | Nov | Nov | Nov | Nov | Nov | Nov | Nov | Nov | Nov | Nov | Nov |
| Dec | Dec | Dec | Dec | Dec | Dec | Dec | Dec | Dec | Dec | Dec | Dec |