Did her department undertake an assessment to establish (a) formal and (b) informal taxi ranks (i) in the (aa) 2009-10, (bb) 2010-11, (cc) 2011-12, (dd) 2012-13 and (ee) 2013-14 financial years and (ii) during the period 1 April 2014 up to the latest specified date for which information is available?