2030 and 25 percent by 2040. National Statistical Office (NSO) figures for 2017 show that 17% (11.3 million) of the Thai population of 66.18 million persons are children under 15; 65.1% (43.09 million) are working age (16–59 years) adults; and 15.5% (10.22 million) are elderly (60+ years). Population growth rate 0.615 percent (2009 est.) 0.566 percent (2011 est.) Net migration rate 0 migrants/1,000 population (2011 est.) Sex ratio At birth: 1.06 males/female Under 15 years: 1.05 males/female 15–64 years: 0.98 males/female 65 years and over: 0.83 males/female Total population: 0.98 males/female (2009 est.) Life expectancy at birth Total population: 73.6 years Male: 71.24 years Female: 76.08 years (2011 est.) Ethnic groups The CIA World Factbook lists Thai at 95.9 percent, Burmese 2 percent, others 1.3 percent, unspecified 0.9 percent. While 2 percent Burmese is accurate and reflects mainly illegal migrants, the Thai figure of 95.9 percent figures is not referenced and contradicts more detailed 2011 Royal Thai Government data which suggests ethnic Central Thai 34.1 percent, ethnic Lao 24.9 percent, ethnic Khon Muang 9.9 percent, ethnic Pak Tai 7.4 percent, ethnic Khmer 2.3 percent, ethnic Malay 1.5 percent. Literacy Definition: age 15 and over can read and write Total population: 92.6 percent Male: 94.9 percent Female: 90.5 percent (2002 est.) References External links World Bank: Thailand Demographics of Asia