How many (a) educators who are foreign nationals taught at each (i) school for learners with special educational needs, (ii) school for the visually impaired and (iii) school for the hearing impaired in each district of each province in the (aa) 2013-14, (bb) 2014-15 and (cc) 2015-16 financial years and (b) of the specified educators were appropriately trained in the respective fields of expertise for each of the specified schools?