The Faculty of Arts and Science at the University of Toronto (U of T) is one of Canada's largest and most prestigious arts and science teaching and research institutions. With almost 22,000 undergraduate and 3,000 graduate students, Arts and Science represents over half the student population on the downtown campus. Overall, 73 per cent of the university's undergraduates and one third of graduates pursue degrees in the humanities, social sciences and sciences. It is home to 800 professors who teach some 2,000 courses arranged in 300 undergraduate and 70 graduate programs hosted by 29 departments, 16 centres and institutes, and seven colleges. Along with a dedicated administrative and technical staff of more than 400, the Faculty is among the most comprehensive in North America. The faculty's Department of Economics has been placed 23rd (1995–99) and 18th (2004–08) by the world rankings and is the strongest Economics faculty in Canada. The Department of Philosophy ranked 15th overall in the English-speaking world and 1st in Canada in the Philosophical Gourmet Report. The Department of Sociology ranks among the top 10 in North America. In the 2010 Academic Ranking of World Universities, the Department of Computer Science placed first overall in Canada, and ranked 10th worldwide.