This is a demography of the population of Sri Lanka including population density, ethnicity, education level, health of the populace, economic status, religious affiliations and other aspects of the population. Sri Lanka is an island in the Indian Ocean, also called Ceylon and many other names. It is about the size of Ireland. It is about 28 kilometres (18 mi.) off the south-eastern coast of India with a population of about 22 million. Density is highest in the south west where Colombo, the country's main port and industrial center, is located. The net population growth is about 0.7%. Sri Lanka is ethnically, linguistically, and religiously diverse. Overview According to the 2012 census the population of Sri Lanka was 20,359,439, giving a population density of 325/km2. The population had grown by 5,512,689 (37.1%) since the 1981 census (the last full census), equivalent to an annual growth rate of 1.1%. 3,704,470 (18.2%) lived in urban sectors - areas governed by municipal and urban councils. 5,131,666 (25.2%) of the population were aged 14 or under whilst 2,525,573 (12.4%) were aged 60 or over, leaving a working age (15-59) population of 12,702,700. The dependency ratio was 60.2%. The mean age was 32 years and the median age was 31 years. The sex ratio was 94 males per 100 females. The fertility rate for married females aged 15 or over was 2.65 live births. There were 5,264,282 households, of which 3,986,236 (75.7%) were headed by males and 1,278,046 (24.3%) were headed by females. Of the 15,227,773 aged 15 or over, 10,322,105 (67.8%) were married, 3,927,602 (25.8%) were never married, 792,947 (5.2%) were widowed and 185,119 (1.2%) were divorced or separated. Of those aged 15 or over, 7,857,370 (51.6%) were economically active, 4,199,558 (27.6%) did housework, 1,431,105 (9.4%) were students, 914,934 (6.0%) were unable to work and 346,084 (2.3%) were pensioners. 521,938 (6.6%) of the economically active were unemployed. 604,540 Sri Lankans were living aboard for more than six months but were intending to return to Sri Lanka, mostly in the Gulf states (373,050 61.7%). The overall literacy rate for those aged 10 and over was 95.7% but amongst those living in the estate sector it was only 86.1%. Of the 18,615,577 aged 5 or over, 499,563 (2.7%) had received a higher education qualification, 2,293,841 (12.3%) had passed G.C.E. A/L, 3,159,402 (17.0%) had passed G.C.E. O/L and 700,419 (3.8%) had no formal schooling. The remaining 11,962,352