Monthly receipts then rose into March 2019 but have fallen slightly since, with the data for June 2019 similar to that for June 2018.
Yna cododd derbyniadau misol i mewn i fis Mawrth 2019 ond maent wedi gostwng ychydig ers hynny, ac mae'r data ar gyfer Mehefin 2019 yn debyg i'r data ar gyfer Mehefin 2018.