WASHINGTON — Reported sexual assaults at the ­nation’s three military academies jumped by 23 percent overall this year, but the data signaled a continued reluctance by victims to seek criminal investigations.

According to a report obtained by the Associated Press, the number of assaults rose from 65 in the 2011 academic year to 80 in 2012. However, nearly half the assaults involved victims who sought confidential medical or other care and did not trigger an investigation. There were 41 assaults reported in 2010.