https://upload.wikimedia.org/wikipedia/commons/8/80/Total_juvenile_detention_chart_for_the_U.S..gif

this is u.s based

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data for 2017 is available here, it is available for the years in the image but the images doesn't show 2017

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https://www.ojjdp.gov/ojstatbb/ezacjrp/asp/Selection_cjrp.asp?state=&topic=&year=2017

population in u.s juvenile bars is

for 2017 by gender

male: 36,982

female: 6,598