The airport's own Sustainable Development Plan puts the current number of stands at between 88 and 116, depending on the mix of aircraft using them. I am sure I read somewhere that the redeveloped airport will have 125 stands, but this is likely to accommodate considerable fewer aircraft than this as this figure is based on Code C aircraft (i.e. B737 / A320 size).
Remember too that during the construction work for any given phase a fair number of stands won't be available.