Terrestrial protected areas are those officially documented by national authorities.
| 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Iceland | 20.2 | 16.7 | 16.7 | 17.4 | 18.2 | 18.2 | 19.5 | 19.9 | 20.3 | 20.8 | 20.8 | 20.9 |
| Norway | 16.8 | 16.9 | 16.9 | 17.0 | 17.1 | 17.1 | 16.8 | 17.6 | 29.9 | 30.5 | 17.7 | 17.8 |
| Denmark | 17.5 | 25.6 | 25.6 | 17.6 | 26.1 | 18.1 | 17.2 | 17.0 | 17.0 | 17.0 | 17.0 | 15.8 |
| Sweden | 14.6 | 14.8 | 14.9 | 14.5 | 14.9 | 14.9 | 14.4 | 14.5 | 14.5 | 15.4 | 15.4 | 15.5 |
| Finland | 14.9 | 15.0 | 15.0 | 14.9 | 15.0 | 15.0 | 13.3 | 13.3 | 13.3 | 13.4 | 13.4 | 13.6 |