With regard to the decision to include trading data from the Southern African Customs Union (SACU) in the calculation of the trade balance, (a) how was this decision reached, (b) when was this decision first taken, (c) what steps were taken in order for it to be possible to include the data, (d) why has the data not been included until now, (e) what technological advances have been made which now allow for the inclusion of this data and (f) what consultation processes were followed to reach this decision?