In respect of each province and district, (a) how many Grade 12 learners and (b) what percentage of Grade 12 learners in public ordinary schools are (i) enrolled to study Mathematics for the 2015 academic year, (ii) registered to write the Mathematics National Senior Certificate Examination for the 2015 academic year and (iii) targeted to be studying Mathematics in the (aa) 2015, (bb) 2016, (cc) 2020 and (dd) 2030 academic years?