| Company | Score | Outlook | Date |
|---|---|---|---|
| DBRS | AAA | Secure | Jul 28 2023 |
| DBRS | AAA | Destructive Watch | Could 25 2023 |
| Fitch | AAA | Destructive Watch | Could 24 2023 |
| Fitch | AAA | Secure | Jul 08 2022 |
| Fitch | AAA | Destructive | Jul 31 2020 |
| DBRS | AAA | Secure | Apr 22 2014 |
| Fitch | AAA | Secure | Mar 21 2014 |
| Fitch | AAA | Destructive Watch | Oct 15 2013 |
| DBRS | AAA | Underneath Assessment | Oct 09 2013 |
| Moody’s | Aaa | Secure | Jul 18 2013 |
| S&P | AA+ | Secure | Jun 10 2013 |
| Fitch | AAA | Destructive | Nov 28 2011 |
| DBRS | AAA | Secure | Sep 08 2011 |
| S&P | AA+ | Destructive | Aug 05 2011 |
| Moody’s | Aaa | Destructive | Aug 02 2011 |
| S&P | AAA | Destructive Watch | Jul 14 2011 |
| Moody’s | Aaa | Destructive Watch | Jul 13 2011 |
| S&P | AAA | Destructive | Apr 18 2011 |
| Fitch | AAA | Secure | Sep 21 2000 |
| Fitch | AAA | N/A | Apr 01 1996 |
| Fitch | AAA | Destructive Watch | Nov 13 1995 |
| Fitch | AAA | N/A | Aug 10 1994 |
| Moody’s | Aaa | Secure | Feb 05 1949 |
