|
Month
|
2011
|
2010
|
2009
|
| January | 3.28 | 3.19 | 3.09 |
| February | 3.28 | 3.28 | 2.45 |
| March | 3.28 | 3.28 | 3.09 |
| April | 3.28 | 3.28 | 3.09 |
| May | 3.28 | 3.28 | 3.15 |
| June | 3.28 | 3.28 | 3.15 |
| July | 3.28 | 3.19 | |
| August | 3.29 | 3.28 | 3.19 |
| September | 3.28 | 3.19 | |
| October | 3.28 | 3.19 | |
| November | 3.28 | 3.19 | |
| December | 3.28 | 3.19 |