The governorate of Muscat comprises six : Muttrah, Bawshar, Seeb, Al Amrat, Muscat and Qurayyat. Seeb, located in the western section of the governorate, was the most populous (with over 220,000 residents), while Muttrah had the highest number of expatriates (with over 100,000). Approximately 71% of the population was within the 15–64 age group, with the average Omani age being 23 years. About 10% of the population is illiterate, an improvement when compared to the 18% illiteracy rate recorded during the 1993 census. Expatriates accounted for over 60% of the labour force, dominated by males, who accounted for 80% of the city's total labour. A majority of expatriates (34%) engineering-related occupations, while most Omanis worked in engineering, clerical, scientific or technical fields. The defense sector was the largest employer for Omanis, while construction, wholesale and retail trade employed the largest number of expatriates.