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Not necessarily.
They just ask a group 400 people if they are interested in a certain release and they give points accoring to the amount of people who were interested in purchasing that certain release.
That's why it's not that of an index since 400 can't represent a whole country or music purchasers. xD
They are right most of the time with the #1 positions but still it's just a minor index, so it doesn't say much.
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