, Oman's population is over 4 million, with 2.23 million Omani nationals and 1.76 million expatriates. The total fertility rate in 2011 was estimated at 3.70. Oman has a very young population, with 43 percent of its inhabitants under the age of 15. Nearly 50 percent of the population lives in Muscat and the Batinah coastal plain northwest of the capital. Omani people are predominantly of Arab, Baluchi and African origins.