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| year | long-term | short-term | outlook |
| 2021 | twaa | twa-1 | stable |
| 2020 | twaa | twa-1 | stable |
| 2019 | twaa | twa-1 | negative |
| 2018 | twaa | twa-1 | stable |
| 2017 | twaa- | twa-1 | positive |
| 2016 | twaa- | twa-1 | stable |
| 2015 | twaa- | twa-1 | stable |
| 2014 | twaa- | twa-1 | stable |
| 2013 | twaa- | twa-1 | stable |
| 2012 | twaa- | twa-1 | negative |
| 2011 | twaa- | twa-1 | negative |
| 2010 | twaa- | twa-1 | stable |
| 2009 | twaa- | twa-1 | stable |
| 2008 | twaa | twa-1 | stable |
| 2007 | twaa | twa-1 | stable |