Historical Bond Ratings
| Company | Rating | Outlook | Effective | Bonds |
| SandP | AA- | Stable | 12/20/2007 | 9 |
| Moodys | Aa2 | No Outlook | 04/23/2010 | 6 |
| Fitch | AA+ | Rating Outlook Stable | 01/07/2014 | 8 |
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| Company | Rating | Outlook | Effective | Bonds |
| SandP | AA- | Stable | 12/20/2007 | 9 |
| Moodys | Aa2 | No Outlook | 04/23/2010 | 6 |
| Fitch | AA+ | Rating Outlook Stable | 01/07/2014 | 8 |