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I found an interesting article that discusses this topic, and I believe it provided a pretty realistic explanation for this. Basically, it stated that the economic and diplomatic sanctions placed on Myanmar by the West had a major impact. The reasoning is not that the rulers of Myanmar particularly cared about the impact of said sanctions on the citizens as much as themselves. It suggests that those people who became rich through their involvement with the government had few places to invest their ill-gotten gains because the West is effectively closed off to them.