China executed more people than any other country in the world last year by putting at least 470 people to death, but the number of executions in the country actually fell compared to the year before, Amnesty International said. In its annual report on worldwide executions, the human rights group said Tuesday that Iran remains the country with the second highest number of executions, and that the number had nearly doubled from the year before. The 377 inmates included a man stoned to death for committing adultery. The United States was fifth in the rankings with 42 executions, reflecting a drop in the number of people put to death during the year. That was the lowest number of executions in the United States in about 15 years, Amnesty officials said. However, lethal injection executions have been on hold nationally while the US Supreme Court considers a challenge in a case from Kentucky.