The economy of Pakistan is the 26th largest in the world in terms of purchasing power parity (PPP), and 41th largest in terms of nominal Gross Domestic Product. Pakistan has a population of over 190 million (the world's 6th-largest), giving it a nominal GDP per capita of $1,427, which ranks 133th in the world. However, Pakistan's undocumented economy is estimated to be 36% of its overall economy, which is not taken into consideration when calculating per capita income. Pakistan is a developing country and is one of the Next Eleven, the eleven countries that, along with the BRICS, have a potential to become one of the world's large economies in the 21st century. However, after decades of war and social instability, as of 2013, serious deficiencies in basic services such as railway transportation and electric power generation had developed. The economy is semi-industrialized, with centres of growth along the Indus River. Primary export commodities include textiles, leather goods, sports goods, chemicals and carpets/rugs.