1921 Census of England and Wales, General Report with Appendices, Table 86 : " English and Welsh Languages: Proportion per 1,000 aged 3 years and upwards at certain Age Groups returned as able to speak English only, Welsh only, and both English and Welsh, 1911 and 1921".

Ages. Language spoken.
English only. Welsh only. Both English and
Welsh.		 Other languages
and no statement.
1911. 1921. 1911. 1921. 1911. 1921. 1911. 1921.
Total 3 years and upwards 537 589 85 63 350 308 28 40
                 
3 and under 5 590 653 130 112 174 155 106 80
5     "      "   10 590 659 97 78 265 216 48 47
10   "      "   15 570 638 60 47 337 275 33 40
15   "      "   25 571 617 46 36 360 309 23 38
25   "      "   45 542 596 62 42 378 327 18 35
45   "      "   65 457 515 126 83 403 366 14 36
65 and upwards 386 441 224 166 378 353 12 40