Closed Access Embargo Metadata Only Access Open Access Restricted Unknown Total
Total 30 62 444 1335 1005 47
2025 1 3 28 24 11 - 67
2024 5 41 25 208 134 1 414
2023 1 4 60 284 180 10 539
2022 2 6 54 229 177 4 472
2021 3 3 57 244 142 10 459
2020 9 5 109 203 188 8 522
2019 9 - 111 141 170 14 445
not yet published - - - 2 3 - 5