International students flocked to US colleges and universities in record numbers in the 2010-11 academic year. The number surged nearly 5 percent over the previous year, reaching 723,277, according to the latest annual "Open Doors" report by the Institute of International Education and the State Department. The jump suggests a global hunger for the cachet and opportunity afforded by an American college education – despite the high cost to families and foreign governments. Foreign students contribute more than $21 billion to the US economy in tuition costs, book-buying, and living expenses – making higher education a top US service-sector export, the report finds. The makeup of international students in the US is changing in some surprising ways. Here are five.