From 1922 to 1948 the total population of the city rose from 52,000 to 165,000, comprised two-thirds of Jews and one-third of Arabs (Muslims and Christians). Relations between Arab Christians and Muslims and the growing Jewish population in Jerusalem deteriorated, resulting in recurring unrest. In Jerusalem, in particular, Arab riots occurred in 1920 and in 1929. Under the British, new garden suburbs were built in the western and northern parts of the city and institutions of higher learning such as the Hebrew University were founded.