Kerala), Islam (26.6%) and Christianity (18.4%). Kerala also had a tiny Jewish population until recently, said to date from 587 BC when they fled the occupation of Jerusalem by Nebuchadnezzar. The 2001 Indian census recorded only 51 Jews in Kerala. The synagogue in Kochi is the oldest in the Commonwealth of Nations. The state has many famous temples, mosques, and churches. The oldest church in India is found in Kerala, believed to be established by St. Thomas, the disciple of Jesus Christ and the Cheramaan Juma Mosque is considered to be the oldest mosque in the Indian subcontinent which was built by an Islamic missionary Malik Dinar. Population graph of Kerala from 1910 to 2011 Source: Features Social development Kerala ranks highest in India with respect to social development indices such as elimination of poverty, primary education and healthcare. This resulted from significant efforts begun in 1911 by the erstwhile Princely states of Cochin and Travancore to boost healthcare and education among the people and aided by the Christian missionaries. This central focus – deemed unusual in India – was then maintained after Kerala's post-independence inauguration as a state. Thus, Kerala has the highest literacy rate in India of 93.91% (2011); and life expectancy is now the highest in India. The suicide rates in Kerala are the highest in India. As per the 2011 census, Kerala and Puducherry are the only domiciles in India with a female-to-male ratio higher than 0.99. The ratio for Kerala is 1.084 – 1084 females per 1000 males – while the national figure is 0.940. It is also one of the states in India to have sub-replacement fertility. UNICEF and the World Health Organization (WHO) designated Kerala as the world's first "baby-friendly state" via its "Baby Friendly Hospital Initiative". The state is also known for Ayurveda, a traditional system of medicine – this traditional expertise is currently drawing increasing numbers of medical tourists. However, drawbacks to this situation includes the population's steady ageing – indeed, 11.2% of Keralites are age 60 or over. Kerala's unusual socioeconomic and demographic situation was summarised by author and environmentalist Bill McKibben: Expatriation and Emigration As of 2011, a total of 2,280,000 Keralites reside outside India. Largest populations are found in UAE (883,313) and USA (680,076). The major concentrations of expat Keralites are in the following nations: (figures as of 2011) UAE – 883,313 United States – 680,076 (mainly U.S.