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MAINLAND CHINA CONTRIBUTION PLAN AND PROFIT APPROPRIATION (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined contribution plan expenses | $ 2,915,327 | $ 2,242,577 | $ 1,948,725
Aggregate balance of statutory common reserves | 39,387,239 | $ 31,991,537 | $ 21,969,950
Restrictions of statutory reserves | $ 366,649,034 |  |

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