United Nations Environmental Program and the World Conservation Monitoring Centre, as compiled by the World Resources Institute, based on data from national authorities, national legislation and international agreements.
| 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Slovenia | 55.3 | 54.1 | 54.1 | 54.1 | 54.0 | 54.0 | 54.0 | 40.0 | 40.1 | 40.1 | 40.1 | 40.2 |
| Poland | 34.2 | 29.3 | 29.3 | 38.0 | 38.1 | 38.1 | 38.1 | 38.0 | 38.0 | 38.0 | 38.0 | 38.2 |
| 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 |
| Bulgaria | 35.0 | 31.5 | 32.8 | 28.3 | 28.3 | 28.3 | 32.8 | 33.1 | 33.1 | 33.1 | 33.1 | 35.6 |
| 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 | 18.1 | 22.5 | 22.6 | 22.6 | 24.3 | 24.3 | 24.4 | 24.4 | 24.4 | 24.4 | 24.4 | 24.3 |
| Croatia | 8.0 | 23.7 | 23.7 | 23.5 | 23.6 | 23.6 | 23.6 | 23.9 | 23.9 | 23.9 | 23.9 | 24.1 |
| 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 | 22.1 | 22.2 | 22.2 | 22.2 | 22.2 | 22.2 | 22.2 | 22.2 | 21.9 |
| Albania | 7.7 | 1.8 | 2.2 | 13.1 | 13.5 | 13.5 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 18.0 |
| Montenegro | 9.6 | 2.6 | 2.6 | 2.6 | 4.2 | 4.2 | 6.9 | 9.0 | 9.0 | 9.2 | 9.2 | 16.1 |
| Serbia | 7.4 | 6.7 | 6.7 | 6.6 | 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 | 1.4 | 1.4 | 1.4 | 1.4 | 3.6 | 4.0 | 4.1 | 4.1 | 9.5 |