"Open Doors" is a comprehensive information resource on the 723,277 international students in the United States in 2010/11 and on the 270,604 U.S. students who studied abroad for academic credit in 2009/10. The Institute of International Education (IIE), one of the largest and most experienced higher education exchange agencies in the world, has conducted an annual statistical survey of international educational exchange into and out of the U.S. since 1948, and with support from the U.S. Department of State's Bureau of Educational and Cultural Affairs since 1972.