We published the first estimate on 19 November 2021, published the second estimate on 23 December 2021 and the third estimate on 27 January 2022.
Fe wnaethom gyhoeddi’r amcangyfrif cyntaf ar 19 Tachwedd 2021, yr ail amcangyfrif ar 23 Rhagfyr 2021 a'r trydydd amcangyfrif ar 27 Ionawr 2022.