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Rating Categories Financial Strength Rating (FSR) Long-term Issuer credit rating (ICR) Effective date
 2024  A++   aa+   October 10, 2024
 2023  A++  aa+  September 21, 2023 
 2022  A++  aa+  September 22, 2022
 2021  A-  a-  September 16, 2021
 2020  A-  a-  September 18, 2020
 2019  A-  a-  September 20, 2019
 2018  A-  a-  September 21, 2018