Statistics for 50 biggest cities in Europe by flags

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Answer	% Correct
Istanbul	95%
London	93%
Moscow	82%
Paris	81%
The Ruhr	72%
Berlin	68%
Madrid	64%
Athens	58%
Barcelona	57%
Rome	51%
Amsterdam	45%
Bucharest	42%
Saint Petersburg	42%
Lisbon	38%
Kyiv	35%
Budapest	32%
Copenhagen	32%
Manchester	32%
Milan	32%
Valencia	32%
Brussels	31%
Hamburg	31%
Lyon	31%
Glasgow	30%
Naples	23%
Porto	23%
Stockholm	23%
Zürich	22%
Birmingham	20%
Stuttgart	20%
Vienna	20%
Warsaw	20%
Munich	19%
Turin	19%
Frankfurt	18%
Minsk	18%
Prague	15%
Rhein-Süd (Cologne Bonn Region)	15%
Belgrade	14%
Liverpool	12%
Marseille	12%
Rotterdam	12%
Katowice	11%
Newcastle-Sunderland	11%
West Yorkshire (Leeds-Bradford)	11%
Donetsk	9%
Nizhny Novgorod	9%
The Hague	9%
Kharkiv	8%
South Yorkshire (Sheffield)	8%