Based on those registered up to June 2013, just over two-thirds were male, over three-quarters were between 25 and 54, and the great majority were White European.
Yn seiliedig ar y rhai a gofrestrwyd hyd at fis Mehefin 2013, roedd ychydig dros ddwy ran o dair ohonynt yn wrywaidd, roedd dros dri chwarter rhwng 25 a 54, a’r mwyafrif helaeth yn Ewropeaidd Gwyn.