Has the National Treasury undertaken any benchmarking (a) studies and/or (b) exercises in relation to health service delivery (i) performance and (ii) expenditure in each province in the (aa) 2011-12, (bb) 2012-13, (cc) 2013-14, (dd) 2014-15 and (ee) 2015-16 financial years; if not, (aaa) why not and (bbb) will the specified (aaaa) studies and/or (bbbb) exercises be undertaken in the future; if so, how did the health service delivery (aaaaa) performance and (bbbbb) expenditure of each province compare to national health priorities during the specified financial years?