As of September 30, 2011
| Plan | September 2011 | YTD 2011 |
| Basic Pension Plan | -4.8% | -4.0% |
| Supplemental Pension Plan | -3.7% | -2.3% |
As of December 31, 2010
| Plan | 1-Year | 3-Year | 5-Year | 10-Year | 20-Year |
| Basic Pension Plan | 13.4% | -0.3% | 3.9% | 4.6% | 8.1% |
| Supplemental Pension Plan | 12.3% | 0.6% | 4.2% | 4.9% | 7.9% |