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1990 -> 3.200.000 : 2 = 1.600.000
1980 -> 1.600.000 : 2 = 800.000
1970 -> 800.000 : 2 = 400.000
1960 -> 400.000 : 2 = 200.000
1950 -> 200.000 : 2 = 100.000
jadi, pd th 1950 ada 100 ribu orang.