(1) Within one month after the 31st December each year a trade union which is the holder of a negotiation licence shall send to the Minister a statement of the number of its members on the 31st December and, if it is necessary to increase or reduce a deposit under Part II of the Trade Union Act, 1941, as amended by section 2 of the Trade Union Act, 1971, by any amount in order to make it equal to the appropriate sum, such trade union shall, not later than four months after the 31st December, increase such deposit by such amount or apply for the return out of such deposit of such amount (as the case may require).

(2) Subsection (1) shall take effect on 1st January, 1991.

(3) The "appropriate sum" in subsection (1) shall be the appropriate sum under -

(a) section 7(2) of the Trade Union Act, 1941, or

(b) section 2(4) of the Trade Union Act, 1971, or

(c) section 21(3) or section 21(4) of this Act,

for the time being, as the case may be.