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You must be careful. Too easily those numbers can be based on simple things like reporting differences.

I know one case where one town had a lot more missing children then another - and after a big outcry, the problem was easily resolved:

Town A had reported children missing if e.g. the parents reported them missing at the police.
Town B had them officially reported as missing when the children did not come home for 24 hours after the parents called the police, which makes sense, since 95% are found inside a few hours.

So town A changed to the reporting method of town B and voila, problem solved!

Please read parts 1-3, where I address this notion and more.

Upvote my post please, so others can read one source of how these kids go missing. Thank You!