From the Master Plan
It is considered unlikely that any of the runway developments will be required during the 20 year planning period of this Master Plan 2009
Yet the same document forecasts more than doubling of passenger numbers both international and domestic in the same time frame with only a 50% increase in aircraft movements.
Given that the airport runs on slot times today, has a master plan that forecasts growth, how on earth can they say that a parallel runway is not required is beyond me.