asked the Minister for Agriculture and Food the total number of staff serving in each of the following areas of the public service on 21 July 1981, 23 December 1981; 31 December 1982; 31 December 1983; 31 December 1984; 31 December 1985; 31 December 1986 and 31 March 1987, (a) industrial civil servants and (b) employees of each non-commercial State body under the aegis of his Department.