|
Month
|
2011
|
2010
|
2009
|
| January | 2.83 | 2.59 | |
| February | 2.83 | 2.59 | |
| March | 2.83 | 2.59 | |
| April | 2.83 | 2.59 | |
| May | 2.83 | 2.59 | |
| June | 2.83 | 2.59 | |
| July | 2.59 | ||
| August | 2.99 | 2.59 | |
| September | 2.59 | ||
| October | 2.59 | 2.59 | |
| November | 2.83 | 2.59 | |
| December | 2.83 | 2.59 |