In January, the proportion of all calls that were immediately life-threatening was 13.9%, down from 14.3% in December, but still the third highest on record.
Ym mis Ionawr, roedd cyfran yr holl alwadau lle’r oedd bywyd yn y fantol yn 13.9%, i lawr o 14.3% ym mis Rhagfyr, a’r trydydd ffigur uchaf ar gofnod.