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1 Million Cities: 2017 - 2018 Variations on the World Map

Can you list cities that between 2017 and 2018 have:
- reached 1 million inhabitants (purple)
- decreased to less than 1 million (red)
- increased by at least 1 million (blue)
- decreased by at least 1 million (black)
Data from www.citypopulation.de
Answers are in alphabetical order
Quiz by scambigol
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First submittedFebruary 3, 2018
Last updatedFebruary 3, 2018
Times taken60
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City
Astana
Bangkok
Cairo
Changde
Concepción
Delhi
Erbil
Fuyang
Ganzhou
Guangzhou
City
Ilorin
Jakarta
Jingzhou
Kananga
Karachi
Kisangani
Kozhikode
Kuala Lumpur
Lahore
Pingxiang
City
San Miguel de Tucumán
Shanghai
Shaoyang
Suqian
Suzhou
Tengzhou
Touba
Weihai
Yibin
Yingkou
+1
level 61
Feb 4, 2018
How did Karachi lose 8.2 million inhabitants in a year? I assume it has to be some kind of administrative redrawing of city borders or a change in the area that citypopulation.de uses?