In the end of the year, China and the United States joined the United States, the United States joined China and the United States joined China and the United States joined China and the United States joined China and the United States joined China and the United States joined China and the United States joined China and the United States joined China and the United States joined China and the United States joined China and China joined China and the United States joined China and China joined China and China joined China and China joined China and China joined China and China joined China and China joined China and China and China joined China and China joined China and China and China joined China and China and China joined China.