|
Month
|
2011
|
2010
|
2009
|
| January | 3.07 | 2.98 | 2.99 |
| February | 3.07 | 3.07 | 1.99 |
| March | 3.07 | 3.07 | 2.58 |
| April | 3.07 | 3.07 | 2.98 |
| May | 3.00 | 3.07 | 2.98 |
| June | 3.00 | 3.07 | 2.98 |
| July | 3.07 | 2.59 | |
| August | 2.88 | 3.07 | 2.98 |
| September | 3.07 | 2.98 | |
| October | 3.07 | 2.98 | |
| November | 3.07 | 2.98 | |
| December | 3.07 | 2.98 |