|
Month
|
2011
|
2010
|
2009
|
| January | 1.98 | 2.09 | 2.08 |
| February | 1.98 | 2.09 | 2.08 |
| March | 1.98 | 2.08 | 2.08 |
| April | 1.98 | 2.08 | 2.20 |
| May | 1.98 | 1.83 | 2.20 |
| June | 1.98 | 1.83 | 2.00 |
| July | 1.83 | 2.00 | |
| August | 1.98 | 1.83 | 2.00 |
| September | 1.83 | 2.00 | |
| October | 1.83 | 2.00 | |
| November | 1.83 | 2.00 | |
| December | 1.83 | 1.56 |