Virtually all citizens of Yemen are Muslims, either belonging to the Zaydi order of Shi'a Islam (50%) or to the Shafi'i order of Sunni Islam (50%). There are also approximately 3,000 Christians, 400 Jews and an extreme minority of Hindus. Islam in Yemen Virtually all citizens of Yemen are Muslims, either belonging to the Zaydi order of Shi'a Islam or to the Shafa'i order of Sunni Islam. While there are no available statistics, estimates are that the Zaydis form approximately 40 percent and the Shafa'is form 50 percent of the general population. There are a few hundred thousand Ismaili and Imami Shias who reside mainly in the north and northeast. There are some non-official Sufi doctrines.
Yemen is a presidential republic with a bicameral legislature. Under the constitution, an elected President, an elected 301-seat Assembly of Representatives, and an appointed 111-member Shura Council share power. The President is the head of state, and the Prime Minister is the head of government.
The population of Yemen was about 28 million according to July 2005 estimates, with 46% of the population being under 15 years old and 2.7% above 65 years. In 1950, it was 4.3 million. By 2050, the population is estimated to increase to about 60 million.
Yemen has one of the world's highest birth rates; the average Yemeni woman bears five children. Although this is similar to the rate in Somalia to the south, it is roughly twice as high as that of Saudi Arabia and nearly three times as high as those in the more modernized Persian Gulf states. Yemen's population is increasing by 700,000 every year.