, Pakistan's estimated nominal GDP is US$284.2 billion. The GDP by PPP is US$1.254 trillion. The estimated nominal per capita GDP is US$1,388, the GDP (PPP)/capita is US$6,016 (international dollars), According to the World Bank, Pakistan has important strategic endowments and development potential. The increasing proportion of Pakistan's youth provides the country with both a potential demographic dividend and a challenge to provide adequate services and employment. 21.04% of the population live below the international poverty line of US$1.25 a day. The unemployment rate among the aged 15 and over population is 5.5%. Pakistan has an estimated 40 million middle class citizens, projected to increase to 100 million by 2050. A 2015 report published by the World Bank ranked Pakistan's economy at 24th-largest in the world by purchasing power and 41st-largest in absolute terms. It is South Asia's second-largest economy, representing about 15.0% of regional GDP.