| Month / Year | Company Rating | Issue Rating | Outlook | Download |
|---|---|---|---|---|
| April 2025 | AA | AA | Stable | 484 KB |
| April 2024 | AA- | AA- | Stable | 481 KB |
| April 2023 | AA- | AA- | Stable | 475 KB |
| April 2022 | AA- | AA- | Stable | 477 KB |
| April 2021 | AA- | AA- | Stable | 453 KB |
| April 2020 | A+ | A+ | Stable | 1.0 MB |
| April 2019 | A+ | A+ | Stable | 938 KB |
| April 2018 | A+ | A+ | Stable | 845 KB |
| March 2017 | A+ | A+ | Stable | 1.2 MB |
| December 2016 | A+ | A+ | Stable | 1.2 MB |
| October 2016 | A+ | A+ | Stable | 1.2 MB |
| March 2016 | A+ | A+ | Stable | 678 KB |
| September 2015 | A- | A- | Stable | 928 KB |
| April 2015 | A- | A- | Stable | 713 KB |
| April 2014 | BBB+ | BBB+ | Stable | 1.0 MB |
| April 2013 | BBB+ | BBB+ | Stable | 1.0 MB |
| July 2012 | BBB+ | BBB+ | Stable | 975 KB |
| May 2010 | BBB+ | BBB+ | Stable | 179 KB |
| October 2009 | BBB+ | BBB+ | Stable | 301 KB |
| July 2009 | BBB+ | BBB+ | Stable | 293 KB |
| May 2009 | BBB+ | BBB+ | Stable | 407 KB |
| November 2008 | A- | A- | Stable | 228 KB |
| March 2008 | A- | A- | Stable | 167 KB |
