Statistics for Biggest Metropolitan Areas According To Wikipedia

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#	Population	City	% Correct
19	15,645 mio people	Bangkok	0%
10	21,893 mio people	Beijing	0%
21	15,355 mio people	Buenos Aires	0%
11	21,381 mio people	Cairo	0%
12	20,937 mio people	Chengdu	0%
3	26,495 mio people	Delhi	0%
18	16,820 mio people	Dhaka	0%
16	19,075 mio people	Guangzhou	0%
27	13,000 mio people	Istanbul	0%
2	31,760 mio people	Jakarta	0%
7	23,545 mio people	Karachi	0%
22	14,112 mio people	Kolkata	0%
26	13,360 mio people	Lagos	0%
6	24,257 mio people	London	0%
20	15,500 mio people	Los Angeles	0%
25	13,484 mio people	Manila	0%
9	22,085 mio people	Mexico City	0%
17	17,125 mio people	Moscow	0%
8	22,885 mio people	Mumbai	0%
14	20,100 mio people	New York City	0%
15	19,302 mio people	Osaka	0%
13	20,850 mio people	São Paulo	0%
4	24,105 mio people	Seoul	0%
5	24,870 mio people	Shanghai	0%
28	12,775 mio people	Shenzhen	0%
24	13,805 mio people	Tehran	0%
23	13,866 mio people	Tianjin	0%
1	37,900 mio people	Tokyo	0%
29	12,600 mio people	Zhengzhou	0%