For comparison, its population was only 20,000 in 1969. Part of the difficulty in estimating the city's population is that part of it is nomadic, setting up tents in suitable locations, then packing up when the need strikes. Some estimates put the 2008 population at over 2 million, estimated to be close to one-third of the country's population. The 2013 census gave the city's population as 958,399.