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| 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | Completed IMO Testing | |
| Countries Database | 44 | 73 | 74 | 77 | 77 | 78 | Not needed |
| No Restrictions | 28 | 51 | 53 | 55 | 49 | 48 | Not needed |
| National Restrictions | 16 | 22 | 22 | 22 | 28 | 30 | 0 |
| Ports with Restrictions* | 20 | 26 | 33 | 35 | 35 | 38 | 0 |
* Ports where there are no national restrictions but local authorities prohibited use.