With reference to all cases referred by the Independent Police Investigative Directorate (IPID) to the SA Police Service, (a) in how many cases were no disciplinary proceedings initiated, as required by section 30(a) of the Independent Police Investigative Directorate Act, Act 1 of 2011, in the (i) 2012-13, (ii) 2013-14, (iii) 2014-15, (iv) 2015-16 and (v) 2016-17 financial years and (b) what were the categories of each of the specified cases, in accordance with section 28 of the IPID Act?