For the period ending 2017, data on people in persistent poverty, defined as being in relative income poverty in at least 3 out of 4 consecutive years.
Ar gyfer y cyfnod a ddaeth i ben yn 2017, data ar bobl mewn tlodi parhaus, a ddiffinnir fel eu bod mewn tlodi incwm cymharol am o leiaf 3 allan o’r 4 blynedd yn olynol.