What kind of agency is reliable for overseas labor services?

By the end of 2018, the number of people learning Chinese around the world will exceed 150 million, and the demand for teachers of Chinese as a foreign language will be at least 5 million. By the end of 2015, the number of Chinese learners that Confucius Institutes around the world could cater to was only 655,000. By the end of 2015, the number of Chinese learners that could be catered for was 1.5 million. This rate is far from meeting the market demand of 150 million. By the end of 2013, the cumulative number of Chinese teachers in Confucius Institutes around the world was only 18,000, and it will reach 50,000 by 2020, while the global demand for foreign teachers is at least 5 million. It can be seen that there will be a serious shortage of teachers teaching Chinese as a foreign language for a long time to come!