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https://www.science.org/cms/asset/089c0893-0dc3-4668-be4a-cff6d3915fad/pap.pdf
Since I don’t know about newer studies, I will correct myself to 2-5% to identify the rest.
My 1% came from a german source (Question at the Bundestag by Die Linke-party) which could still be correct though:
https://dserver.bundestag.de/btd/19/040/1904087.pdf