Moody's Investors Service Rating Forecast
| 13.06.2012 | Baa3 | ||
| 13.02.2012 | A3 | Negative | |
| 18.10.2011 | A1 | Negative | |
| 10.03.2011 | Aa2 | Negative | |
| 15.12.2010 | Aa1 | Negative | |
| 30.09.2010 | Aa1 | Stable | |
| 13.12.2001 | Aaa | Stable |
Standard & Poor's
| 10.10.2012 | BBB- | Negative | |
| 26.04.2012 | BBB+ | Negative | |
| 13.01.2012 | A | Negative | |
| 21.11.2011 | AA- | Negative | |
| 13.10.2011 | AA- | Negative | |
| 28.04.2010 | AA | Negative | |
| 09.12.2009 | AA+ | Negative | |
| 19.01.2009 | AA+ | Stable | |
| 12.01.2009 | AAA | Negative |
Fitch Ratings
| 07.06.2012 | BBB | Negative | |
| 27.01.2012 | A | Negative | |
| 07.10.2011 | AA- | Negative | |
| 28.05.2010 | AA+ | Stable | |
| 19.01.2009 | AAA | Stable | |
| 02.06.2008 | AAA | Stable | |
| 10.12.2003 | AAA | Stable | |
| 21.09.2000 | AA+ | Stable | |
| 01.09.1999 | AA+ | ||
| 14.07.1998 | AA | ||
| 26.10.1995 | AA | ||
| 10.08.1994 | AA |
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