Terrestrial protected areas are those officially documented by national authorities.
| 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bulgaria | 45.2 | 40.6 | 40.6 | 34.7 | 34.7 | 34.7 | 40.6 | 41.0 | 41.0 | 41.0 | 41.0 | 44.3 |
| Slovenia | 54.9 | 53.6 | 53.6 | 53.6 | 53.6 | 53.6 | 53.6 | 40.4 | 40.4 | 40.4 | 40.4 | 40.5 |
| Poland | 35.4 | 30.0 | 30.0 | 39.6 | 39.7 | 39.7 | 39.7 | 39.5 | 39.5 | 39.6 | 39.6 | 39.6 |
| Croatia | 13.8 | 38.0 | 38.0 | 38.1 | 38.3 | 38.3 | 38.3 | 38.4 | 38.4 | 38.5 | 38.5 | 38.4 |
| Slovak Republic | 35.9 | 36.8 | 36.8 | 37.3 | 37.3 | 37.6 | 37.6 | 37.6 | 37.6 | 37.6 | 37.6 | 37.5 |
| North Macedonia | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 10.6 | 9.0 | 12.5 | 15.4 | 15.4 | 28.2 |
| Romania | 19.4 | 24.2 | 24.4 | 24.4 | 24.5 | 24.5 | 24.5 | 24.5 | 24.5 | 24.5 | 24.5 | 24.6 |
| Albania | 10.1 | 2.1 | 2.6 | 17.2 | 17.7 | 17.7 | 18.6 | 18.6 | 18.6 | 18.6 | 18.6 | 23.6 |
| Hungary | 23.2 | 22.6 | 22.6 | 22.6 | 22.6 | 22.6 | 22.6 | 22.6 | 22.6 | 22.6 | 22.6 | 22.6 |
| Czechia | 21.9 | 21.8 | 21.7 | 21.7 | 22.2 | 22.2 | 22.2 | 22.2 | 22.2 | 22.2 | 22.2 | 21.9 |
| Montenegro | 14.6 | 4.1 | 4.1 | 4.1 | 6.4 | 6.4 | 10.5 | 13.8 | 13.8 | 13.9 | 13.9 | 21.7 |
| Serbia | 7.4 | 6.7 | 6.7 | 6.2 | 6.6 | 6.6 | 7.6 | 7.6 | 7.6 | 8.1 | 8.1 | 13.4 |
| Moldova | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 11.4 | 11.4 | 11.4 | 11.5 |
| Bosnia and Herzegovina | 1.6 | 1.1 | 1.5 | 1.5 | 1.4 | 1.4 | 1.4 | 3.6 | 4.0 | 4.1 | 4.1 | 9.5 |