The first breakdown by religion of RUC was in 1993, and numbers of Catholics were believed to have fallen by then for the reasons alluded to.

"The RUC has 13,014 officers, of whom 898 are Catholic. Of the 6,161 constables, 438 (7.1 per cent) are Catholic. This percentage rises steadily through the senior ranks, however, so that the percentage of inspectors is 9 per cent, that of superintendents 13 per cent, and that of chief superintendents more than 14 per cent."
http://www.independent.co.uk/news/uk/catholics-make-up-7-of-ruc-1481268.html

I reckon over 7% constitutes a significant number.
Why the hostility Peter?