How important was international trade in the growth of China from 1980-2010?

How important is it now? a. What types of products did China sell abroad, and how did that change over time? Does the type of product being sold abroad matter? b. Why does it matter whether the goods produced by China are sold to buyers abroad or sold to buyers inside China? c. Why would selling to foreign consumers increase productivity within China? d. As wages in China rise, how does that affect the role that international trade plays in the Chinese economy? e. What do the experiences of South Korea, Taiwan and other Asian economies suggest about how international trade evolves as a country becomes richer?