KABUL — The Afghan government has hit a grim record in its quest to take over the country’s security from coalition forces: more than 1,000 Afghan soldiers died in 2012, a roughly 20 percent increase from 2011.

Though the Afghan Army’s death rates have outstripped those for international forces in recent years, the new figures show the widest margin yet, as more Afghan units have taken the field. International troops were reported to have lost about 400 soldiers in 2012, the lowest number since 2008, and many of those were the result of insider attacks.