|
Month
|
2011
|
2010
|
2009
|
| January | 3.28 | 4.35 | 4.35 |
| February | 4.35 | 4.35 | 3.99 |
| March | 3.28 | 4.35 | 3.99 |
| April | 3.28 | 4.35 | 4.35 |
| May | 4.35 | 4.35 | 4.35 |
| June | 4.35 | 4.35 | 4.35 |
| July | 4.35 | 4.35 | |
| August | 3.29 | 4.35 | 4.35 |
| September | 4.35 | 4.35 | |
| October | 3.28 | 4.35 | |
| November | 4.35 | 4.35 | |
| December | 3.28 | 4.35 |