The latest experimental statistics (2020) produced by the Office for National statistics suggest that service exports make up approximately 30% of total exports in Wales, and 20% of total imports.
Mae'r Asesiad o'r Effaith ar Draffig (TIA), dyddiedig 2020, yn awgrymu mai unedau'r parc busnes fyddai'n gyfrifol am y traffig mwyaf o bell ffordd.