Qatar population was 2.6 million: 313,000 Qatari citizens and 2.3 million expatriates. Islam is the official religion of Qatar. The country has the highest per capita income in the world. Qatar is classified by the UN as a country of very high human development and is widely regarded as the most advanced Arab state for human development. Qatar is a high-income economy, backed by the world's third-largest natural gas reserves and oil reserves. Qatar has been ruled by the House of Thani since Mohammed bin Thani signed a treaty with the British in 1868 that recognised its separate status. Following Ottoman
Abdullah al-Thani after Islamist lawmakers convened a new meeting of the General National Congress in Tripoli and declared al-Thani dismissed, although he defended the elected Council of Deputies as "the only legitimate authority in the country". The next week, however, the Tobruk-based lawmakers reappointed al-Thani as prime minister and tasked him with forming a "crisis government". With Libya sliding into civil war between the two rival governments, al-Thani ordered General Khalifa Haftar to "liberate" Tripoli in October 2014. In March 2015, following the start of a military intervention in support of the internationally recognised government in Yemen, al-Thani compared the situation in