Statistics for Most populous cities on islands

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Population	Metro area	Extra hint	% Correct
37,4 m	Tokyo	-	100%
8,5 m	Taipei	-	99%
31,6 m	Jakarta	-	97%
14,2 m	London	-	96%
22,7 m	Manila	-	94%
1,9 m	Dublin	-	93%
3,3 m	Manchester	-	93%
2,1 m	Havana	-	91%
19,3 m	Osaka	-	91%
4,3 m	Birmingham	-	90%
1,6 m	Glasgow	-	88%
2,2 m	Liverpool	-	87%
10,2 m	Nagoya	-	87%
22,6 m	New York City	Some districts on islands, some not	87%
2,6 m	Port-au-Prince	-	87%
2,9 m	Santo Domingo	-	87%
1,9 m	Sapporo	-	85%
2,6 m	Leeds	-	84%
5,7 m	Singapore	-	84%
5,6 m	Colombo	-	79%
1,4 m	Hiroshima	Japan	76%
7,5 m	Hong Kong	Largest district is on the mainland	76%
1,3 m	Copenhagen	-	75%
1,3 m	Palermo	Europe. Not the UK	73%
1,6 m	Antananarivo	-	72%
1,6 m	Auckland	-	70%
2,5 m	Fukuoka	Japan	70%
1,5 m	Sheffield	United Kingdom	69%
13,3 m	Surabaya	-	69%
1,6 m	Newcastle upon Tyne	-	67%
8,2 m	Bandung	Indonesia	66%
2,8 m	Cebu City	Philippines	66%
4,6 m	Medan	-	54%
20,7 m	Mumbai	Assumpted to be built on seven islands	54%
1,5 m	Southampton	United Kingdom	54%
1,6 m	Nottingham	United Kingdom	51%
2,5 m	Davao City	Philippines	48%
2,5 m	Kaohsiung	Taiwan	46%
1,4 m	Abu Dhabi	Not 100% sure if it meets the criterias I made. But in the Middle East	42%
1,7 m	Montréal	-	40%
1,6 m	Sendai	Japan	40%
2,7 m	Makassar	Indonesia	39%
2,3 m	San Juan	-	37%
1,8 m	Palembang	Indonesia	34%
2,6 m	Taichung	Taiwan	33%
1,2 m	Tainan	Taiwan	31%
9,9 m	Xiamen	Two districts on an island	28%
3,1 m	Semarang	Indonesia	27%
1,7 m	Haikou	Asia	18%
1,0 m	Niigata	Japan	16%