With reference to his reply to question 2940 on 16 November 2023, what total number of cases did the National Prosecuting Authority refer back to the SA Police Service with directions for further investigation in the [a] 2018 to 2019, [b] 2019 to 2020, [c] 20/20/21, [d] 2021 to 2022 and [E] 2022 to 2023 financial years?