| Date of Evaluation | Evaluating Company | Credit Rating |
|---|---|---|
| Jun 2020 | Korea Ratings | A+ Stable |
| NICE Credit Rating | ||
| Oct 2019 | Korea Ratings | A+ Stable |
| NICE Credit Rating | ||
| Jun 2018 | Korea Ratings | A+ Stable |
| NICE Credit Rating | ||
| Sep 2017 | Korea Ratings | A+ Stable |
| NICE Credit Rating | ||
| Jun 2017 | Korea Ratings | A+ Stable |
| NICE Credit Rating |