It’s the latest snapshot of the growing burden of student debt and it’s another discouraging one: Two-thirds of the national college class of 2011 finished school with loan debt, and those who borrowed walked off the graduation stage owing on average $26,600 — up about 5 percent from the class before.

The latest figures are calculated in a report out Thursday by the California-based Institute for College Access and Success, also called TICAS, and probably underestimate the problem in some ways because they don’t include most graduates of for-profit colleges, who typically borrow more than their counterparts elsewhere.