How many cases of witnesses that have (a) been attacked and/or (b) died while under witness protection resulted in (i) completed investigations, (ii) pending proceedings before the courts and (iii) convictions and (c) members of SA Police Service (i) face pending proceedings before the courts and/or (ii) have been convicted as a result (aa) in the (aaa) 200910, (bbb) 201011, (ccc) 201112, (ddd) 201213, (eee) 201314 and (fff) 201415 financial years and (bb) from 1 April 2015 up to the latest date for which information is available?