According to a 1997 census by the Palestinian Central Bureau of Statistics (PCBS), Gaza and the adjacent al-Shati camp had a population of 353,115, of which 50.9% were males and 49.1% females. Gaza had an overwhelmingly young population with more than half being between the ages of infancy to 19 (60.8%). About 28.8% were between the ages of 20 to 44, 7.7% between 45 and 64, and 3.9% were over the age of 64. A massive influx of Palestinian refugees swelled Gaza's population after the 1948 Arab–Israeli War. By 1967, the population had grown to about six times its 1948 size. In 1997, 51.8% of Gaza's inhabitants were refugees or their descendants. The city's population has continued to increase since that time to 590,481 in 2017, making it the largest city in the Palestinian territories. Gaza City has one of the highest overall growth rates in the world. Its population density is 9,982.69/km² (26,424.76/sq mi) comparable to New York City (10,725.4/km² – 27,778.7/sq mi), half of Paris density (21,000/km² – 55,000/sq mi). In 2007 poverty, unemployment and poor living conditions were widespread and many residents received United Nations food aid. The population of Gaza is overwhelmingly composed of Muslims, who mostly follow Sunni Islam. During the Fatimid period, Shia Islam was dominant in Gaza, but after Saladin conquered the city in 1187, he promoted a strictly Sunni religious and educational policy, which at the time was instrumental in uniting his Arab and Turkish soldiers. Gaza is home to a small Palestinian Christian minority of about 3,500 people. The majority live in the Zaytun Quarter of the Old City and belong to the Greek Orthodox, Roman Catholic, and Baptist denominations. In 1906 there were about 750 Christians, of which 700 were Orthodox and 50 were Roman Catholic. Gaza's Jewish community was roughly 3,000 years old, and in 1481 there were sixty Jewish households. Most of them fled from Gaza after the 1929 Palestine riots, when they consisted of fifty families. In Sami Hadawi's land and population survey, Gaza had a population of 34,250, including 80 Jews in 1945. Most of them left the city after the 1948 War, due to mutual distrust between them and the Arab majority. Today, there are no Jews living in Gaza.