In 1950, Vietnam was at stage 2 of the Demographic Transition Model. This was most likely because Vietnam was a mostly agricultural society before the events of World War ll, which then further lowered population, leading to an increased number of people at the base of the pyramid. Then, in 1975, The pyramid has grown thicker at the base, which is surprising due to the Vietnam War which had been raging from 1956 to April of that year. Next, in 2000, although the population was the 13th largest in the world, it's growth rate declined significantly, as is shown by the decrease in overall population which shows the transition of Vietnam to stage 3 of the DTM. Lastly, in the year in 2015, population has decreased by a small amount, which is due to various things, but mostly relating to Vietnam's 2 child policy which was started in 2012 and undetonated land mines remaining from the Vietnam War, which have killed at a minimum 42,000 people.
In the year 2050, Vietnam will have solidified their place in stage 3 of the DTM if they were to continue the way they limit population, advance in technology and medicine, and continue to not involve in wars at the same pace. It would make sense they would still be in stage 3 of the DTM due to the 2 child limit policy and current medical technology in Vietnam, however these are both subject to change in the near future. And in 2099, the population has really smoothed out, leaving an almost perfectly smooth tower. the homogeneity of this stage is what appears to be the start of a stage 4 pyramid, due to the way it almost caves i at the bottom. This could be attributed the steady pace of Vietnam's current Natural Increase Rate.
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