| 时间(年底) | 历史股息增长率均值 | 预期股权回报 |
| 2004 | 11.80% | 20.97% |
| 2005 | 11.80% | 22.38% |
| 2006 | 11.80% | 15.19% |
| 2007 | 11.80% | 12.85% |
| 2008 | 11.80% | 14.76% |
| 2009 | 11.80% | 13.59% |
| 2010 | 11.80% | 13.97% |