A new study says the number of U.S. college students graduating with loan debt is on the rise. According to the Project on Student Debt, 71 percent of students graduated with debt last year, up from 68 percent in 2008. The average debt load was $29,400, an increase of 6 percent every year. African-American students were most likely to graduate with heavy debt, with almost one-third owing at least $30,000.