When did China become the world's largest source country for outbound tourists?

20 13 China becomes the largest outbound tourist source country in the world. According to relevant public information, since 20 13, it has continuously maintained its position as the world's largest outbound tourist source country. According to the announcement made by the people of China and the Ministry of Foreign Affairs of China in 20 12, China became the world's largest outbound tourist consumer for the first time.