(1) How many (a) persons are employed at the International Mail Centre situated at Jet Park in Johannesburg and (b) of these employees are (i) management, (ii) permanent, (iii) casual or temporary, (iv) employed by the SA Post Office and (v) employed by third parties; (2) (a) how many posts are currently vacant, (b) in what categories are these vacant posts in each case and (c) what steps are being taken to fill these vacancies?