| Period | Index | Previous Year | Previous Month |
|---|---|---|---|
| February, 2011 | 89.3 | 1.9% | 0.7% |
| January, 2011 | 88.7 | 1.6% | -0.3% |
| December, 2010 | 89.0 | 1.4% | 0.7% |
| November, 2010 | 88.4 | 1.5% | 0.1% |
| October, 2010 | 88.3 | 1.3% | 0.1% |
| September, 2010 | 88.2 | 1.3% | -0.1% |
| August, 2010 | 88.3 | 0.9% | 0.1% |
| July, 2010 | 88.2 | 1.0% | 0.1% |
| June, 2010 | 88.1 | 0.9% | 0.0% |
| May, 2010 | 88.1 | 1.3% | 0.0% |