(a) What is the total number of state-subsidised houses that required rectification in each metropolitan municipality in the (i) (aa) 2012-13, (bb) 2013-14, (cc) 2014-15 and (dd) 2015-16 financial years and (ii) since 1 June 2016 up to the latest specified date for which information is available and (b) what is the total amount that each of the specified metropolitan municipalities spent on the rectification of the specified state-subsidised houses?