Task: Question Generation
Input (English): Passage: The city of Bangkok has a population of 8,280,925 according to the 2010 census, or 12.6 percent of the national population. In 2018, the population has been estimated to be about 10 million. Roughly half are internal Thai immigrants from other provinces. Only 5,692,284 residents, belonging to 2,672,423 households, registered Bangkok as their legal domicile. A large number of Bangkoks daytime population commutes from surrounding provinces in the Bangkok Metropolitan Region, the total population of which is 14,565,547. Bangkok is a cosmopolitan city; the census showed that it is home to 81,570 Japanese and 55,893 Chinese nationals, as well as 117,071 expatriates from other Asian countries, 48,341 from Europe, 23,418 from the Americas, 5,289 from Australia and 3,022 from Africa. Immigrants from neighbouring countries include 303,595 Burmese, 63,438 Cambodians and 18,126 Lao. In 2018, numbers show that there are 370,000 international migrants registered with the Department of Employment, more than half of them migrants from Cambodia, Laos, and Myanmar.
Output (English): Which segments of the population had less than 20,000 citizens?