In light of the publication by his department of the critical skills list in the Government Gazette 44164 on 18 February 2021 that was last updated in 2014, and considering the staggering unemployment rate in the Republic, what (a) factors were taken into account by his department in determining what skills can be regarded as critical in the Republic and (b) are the details of the investigations and findings that were undertaken by his department since 2014 to enable it to draft the specified list?