In December 2007, Jerusalem had a population of 747,600—63.7% were Jewish, 33.1% Muslim, and 2% Christian. At the end of 2005, the population density was . According to a study published in 2000, the percentage of Jews in the city's population had been decreasing; this was attributed to a higher Muslim birth rate, and Jewish residents leaving. The study also found that about nine percent of the Old City's 32,488 people were Jews. Of the Jewish population, 200,000 live in East Jerusalem settlements which are considered illegal under international law.