Israel has a tradition of higher education where its quality university education has been largely responsible in spurring the nations modern economic development. Israel has nine public universities that are subsidized by the state and 49 private colleges. The Hebrew University of Jerusalem, Israel's second-oldest university after the Technion, houses the National Library of Israel, the world's largest repository of Judaica and Hebraica. The Technion and the Hebrew University consistently ranked among world's 100 top universities by the prestigious ARWU academic ranking. Other major universities in the country include the Weizmann Institute of Science, Tel Aviv University, Ben-Gurion University of the Negev, Bar-Ilan University, the University of Haifa and the Open University of Israel. Ariel University, in the West Bank, is the newest university institution, upgraded from college status, and the first in over thirty years.