(1) (a) How did the National Prosecuting Authority calculate its conviction rate for the 2015-16 financial year and (b) which factors did it take into account when calculating the specified rate; (2) (a) what is the total number of cases that (i) were withdrawn in each region in the specified financial year and (ii) were re-enrolled in the 2016-17 financial year and (b) what are the relevant details in each case?