Did you create a tool to find this with different variations?
More or less 
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For example, I would like to know, how many chips with 1 BTC value are out there.
Do you want only current data, or also historic data?Quote
Can something like the following URL be formulated for this calculation?
Nope, I don't do PHP. I could run the script again with for 1000 mBTC though (but it's quite slow, it has to decompress all data). I've started it, if it doesn't fail I'll post the results tomorrow.