(1) How many (a) investigations were conducted for (i) overbilling and (ii) overcharging for goods and services rendered by external contractors and service providers for the (aa) 2009-10, (bb) 2010-11, (cc) 2011-12, (dd) 2012-13 and (ee) 2013-14 financial years, (b) of these investigations were conducted (i) internally, (ii) by the Office of the Public Protector, (iii) by the SA Police Service, (iv) by the Special Investigating Unit or (v) by external private sector entities; (2) what (a) amount was lost by his department due to (i) overbilling or (ii) overcharging and (b) was the (i) outcome of each investigation and (ii) breakdown of monies recovered for each specified financial year?