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Table 1 Number of population in Thailand : 1911 - 1990 census years.

Census year Number of population
19118,266,408
19199,207,355
192911,506,207
193714,464,105
194717,442,689
196026,257,916
197034,397,374
198044,824,540
199054,548,530


​Source :
(1) Report of the Survey of family Registration 1911, 1919, 1929, 1937 and 1947
(2) Population and Housing census 1960, 1970, 1980 and 1990, National Statistical office.