Closed Access Embargo Metadata Only Access Open Access Restricted Unknown Total
Total 25 53 434 1275 966 46
2025 1 - 13 12 4 - 30
2024 - 33 32 194 117 - 376
2023 1 5 53 276 175 9 519
2022 2 6 51 219 175 4 457
2021 3 4 60 235 139 11 452
2020 9 5 111 201 185 8 519
2019 9 - 114 136 168 14 441
not yet published - - - 2 3 - 5