Ringing Forums

In the RW report of the Sonning Deanery AGM in 1930 the chairman is quoted as saying:
'The number of ringers in the country was 46,083 - 240 les than last year. The year before that there were 410 more. The diocese of Oxford held second place for numbers, the greatest number being in Exeter Diocese, while Bath and Wells came third.'.
Such precise figures for different years suggest someone was tracking the number in detail, and since the chairman, G F Coleridge, was also the CC president at the time I assume it was the CC, collating figures supplied by affiliated societies.
I've failed to find any mention of the topic in Council reports of the time (1928, 1929, 1930).
Is anyone aware of this work, and where it is recorded?