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June 5, 2015 9:07 AM EDT

How do you measure how much drugs a city’s residents are using? One way is to check the sewers. According to new research from the E.U., London residents flush away the most cocaine of any major European city.

The study, which looked at 50 cities around Europe, found that 737 mg of cocaine was flushed per 1,000 people each day last year, according to the BBC. Amsterdam came in second place with 716 mg, and Antwerp in third with 632 mg.

Peak days for cocaine-flushing in London are Fridays and Saturdays, with Sundays and Mondays showing a significant drop-off.

[BBC]

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