The San Francisco-based Dui Hua Foundation said Tuesday that the decline was revealed at a seminar with Chinese officials earlier this month.

The group said Chinese officials refused to say how many people were put to death annually but revealed the number fell 50 percent after 2007. In 2006, state media estimated there were 8,000 executions a year.

Dui Hui founder John Kamm urged China to be more open with its execution statistics, saying that transparency would help China achieve its goal of eventually abolishing the death penalty.