| Outlook | Effective |
| Stable | 24.09.2021 |
| Positive | 25.09.2020 |
| Stable | 09.03.2018 |
| Foreign Currency LT Debt | Effective |
| Baa2 | 24.09.2021 |
| Baa3 | 09.03.2018 |
| Ba1 | 24.11.2011 |
| Baa3 | 06.12.2010 |
| Baa1 *N | 31.03.2009 |
| A3 | 07.11.2008 |
| A2 | 22.12.2006 |
| A1 *N | 22.09.2006 |
| A1 | 12.11.2002 |
| A3 | 14.11.2000 |
| Baa1 *P | 13.09.2000 |
| Baa1 | 25.06.1999 |
| Baa2 | 09.05.1998 |
| Baa3 *P | 20.03.1998 |
| Baa3 | 19.12.1996 |
| Ba1 *P | 14.10.1996 |
| Ba1 | 13.07.1990 |
| Baa2 | 18.07.1989 |
If *P or *N = within 3 months rating is likely to move up (Positive) or down (Negative).