(1) How many members of staff were in the employ of his department (a) in (i) 2009, (ii) 2010, (iii) 2011 and (iv) 2012 and (b) since 1 January 2013; (2) (a) how many of these staff members were (i) members of a trade union and (ii) not members of a trade union and (b) of which individual trade unions were these workers members; (3) whether all above-mentioned trade unions are recognised by his department; if not, why not; if so, what are the relevant details?