< 1.10 – Extremely low

1.10 – 1.29 – Very low

1.30 – 1.44 – Low

1.45 – 1.54 – Shrinking

1.55 – 1.69 – Slightly shrinking

1.70 – 1.99 – Stable

≥ 2.00 – Replacement level achieved

Source: Database.earth 2023

Created by: Petr Kirpeit 2025