There was an increase in such sites between January 2024 and January 2025, following a similar increase between January 2023 and January 2024.
Gwelwyd cynnydd mewn safleoedd o'r fath rhwng Ionawr 2024 a Ionawr 2025, yn dilyn cynnydd tebyg rhwng Ionawr 2023 a Ionawr 2024.