Care should be taken when interpreting these indices, estimates for individual quarters can fluctuate and it is recommended that emphasis is based on longer-term trends.
Dylid cymryd gofal wrth ddehongli’r mynegai yma, gall amcangyfrifon ar gyfer chwarteri unigol amrywio ac argymhellir canolbwyntio ar dueddiadau tymor hirach.