I'm honestly not clear of the author's intention. I would have used present perfect: Since 1985, they 've opened... Usually, if you read "Since [date]," your assumption would be from that date until the present.
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When it decided to reform the national economic setup in 1978, the Chinese government embarked on a policy of opening to the outside world in a planned way and step by step. Since 1980, China has established special economic zones in Shenzhen, Zhuhai and Shantou in Guangdong Province and Xiamen in Fujian Province, and designated the entire