By the end of 1995, the convention had been signed by 43 states and it came into force on 15 January 1999 after it had been ratified by 22 states. As of June 2016, the treaty has been ratified by 93 states, which includes 92 UN member states plus the State of Palestine. The states that signed the convention but have not yet ratified it are Haiti, Honduras, Malta, Pakistan, Sierra Leone, and the United States.