I think Darryl's explanation is right. All Dutch colonies have a large amount of semipostals. As to the need for the relatively small population: you can also wonder why Greenland, with a population of less than 60,000 needs so many stamps. Or all the small islands in the Atlantic and Pacific for that matter.
The answer is of course obvious: these stamps are there for us, the collectors, not for the people of these countries. Compared to some of the other stamp issuing countries, Surinam is a giant :-)

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