| 연도 등급 | 1등급 | 2등급 | 3등급 | 4등급 | 합계 |
|---|---|---|---|---|---|
| 2014 | 1 (8%) | 5 (42%) | 6 (50%) | - | 12 (100%) |
| 2015 | 11 (34%) | 4 (13%) | 13 (40%) | 4 (13%) | 32 (100%) |
| 2016 | 5 (71%) | - | 2 (29%) | - | 7 (100%) |
| 2017 | - | 1 (25%) | 1 (25%) | 2 (50%) | 4 (100%) |
| 2018 | 3 (100%) | - | - | - | 3 (100%) |
| 2019 | 1 (9%) | 1 (9%) | 8 (73%) | 1 (9%) | 11 (100%) |
| 2020 | 5 (20%) | 4 (16%) | 14 (56%) | 2 (8%) | 25 (100%) |
| 2021 | 8 (32%) | 2 (8%) | 14 (56%) | 1 (4%) | 25 (100%) |
| 2022 | 10 (34%) | 11 (38%) | 6 (21%) | 2 (7%) | 29 (100%) |
| 합계 | 44 (30%) | 28 (19%) | 64 (43%) | 12 (8%) | 148 (100%) |