| 2012 | February | [4th] |
| | January | [28th] [21st] [14th] |
| 2011 | December | [24th] [17th] [10th] [3rd] |
| | November | [26th] [19th] [12th] [5th] |
| | October | [1st] |
| | September | [24th] [17th] [10th] [3rd] |
| | August | [27th] |
| | July | [30th] [23rd] [16th] [9th] [2nd] |
| | June | [25th] [18th] [11th] [4th] |
| | May | [28th] [21st] [14th] [7th] |
| | April | [30th] [23rd] [16th] [9th] [2nd] |
| | March | [26th] [19th] [12th] [5th] |
| | February | [26th] [19th] [12th] [5th] |
| | January | [29th] [22nd] [15th] |
| 2010 | December | [18th] [11th] [4th] |
| | November | [27th] [20th] [13th] [6th] |
| | October | [29th] [22nd] [15th] [8th] [1st] |
| | September | [17th] [10th] [3rd] |
| | August | [28th] [21st] [13th] [6th] |
| | July | [30th] [24th] [17th] [10th] [2nd] |
| | June | [25th] [18th] [11th] [4th] |
| | May | [28th] [21st] [14th] [7th] |
| | April | [23rd] [16th] [9th] [2nd] |
| | March | [26th] [19th] [12th] [10th] [5th] |
| | February | [26th] [19th] [12th] [5th] |
| | January | [29th] [22nd] [15th] [8th] [5th] |
| 2009 | December | [18th] [11th] [4th] |
| | November | [27th] [20th] [13th] [6th] |
| | October | [30th] [23rd] [16th] [9th] [2nd] |
| | September | [25th] [18th] [11th] [4th] |
| | August | [28th] [21st] [14th] [7th] [1st] |
| | July | [24th] [17th] [3rd] |
| | June | [26th] [19th] [12th] [5th] |
| | May | [29th] [22nd] [15th] [8th] |
| | April | [24th] [17th] [10th] [3rd] |
| | March | [27th] [20th] [13th] [6th] |
| | February | [27th] [13th] [6th] |
| | January | [30th] [23rd] [16th] [9th] |
| 2008 | December | [19th] [12th] [5th] |
| | November | [28th] [21st] [14th] [7th] |
| | October | [31st] [24th] [17th] [10th] [3rd] |
| | September | [26th] [19th] [12th] [5th] |
| | August | [29th] [22nd] [15th] [8th] [1st] |
| | July | [25th] [18th] [11th] [4th] |
| | June | [27th] [20th] [13th] [6th] |
| | May | [30th] [23rd] [16th] [9th] [2nd] |
| | April | [26th] [17th] |
| | March | [28th] [21st] [14th] [7th] |
| | February | [29th] |