Whether, with regard to the proposed National Health Insurance (NHI), any financial modelling has been undertaken by the National Treasury (a) in the (i) 2019-20, (ii) 2020-21 and (iii) 2021-22 financial years and (b) during the period 1 January 2022 up to the latest specified date for which information is available to calculate the total cost of the (i) implementation and (ii) administration of the proposed NHI; if not, why not; if so, (aa) what are the relevant details and (bb) how has the economic impact of the COVID-19 pandemic affected financial modelling for financing the NHI?