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This article shows the (absolute) population of nearly all the political countries and dependencies in the world from 1950 to 2050. This one-century timespan provides a broad perspective on demographic change across the globe. According to these estimates, it can be seen that the United States surpassed the combined population of the fifteen republics of the former Soviet Union around the year 2003, and that by 2025 India is projected to overtake China as the world's most populous country. ==Introduction== The figures shown here have been entirely taken (and processed) from the International Data Base (IDB) Division of the United States Census Bureau. Every individual value has been automatically rounded to the nearest thousand, to assure data coherence, particularly when adding up (sub)totals. Although data from specific statistical offices may be more accurate, the information provided here has the advantage of being homogeneous. Population estimates, ''as long as they are based on recent censuses'', can be more easily projected into the ''near'' future than many macroeconomic indicators, such as GDPs, which are much more sensitive to political and/or economic crises. This means that it is more accurate to make demographic estimates for the next five (or even ten) years than trying to calculate the probable evolution of a GDP through the same time period (besides, in this latter case, deflacting has to be taken into account to compensate or make up for the distortion caused by inflation). However, no projected population figures can be considered exact. In the IDB's particular case, figures beyond the years 2020-2025 should be taken with caution, as the ''census way towards those years has yet to be paved''. Thus, from a present-day point of view, it is as if a demographer was looking through a kind of ''cloudy glass'' 〔Britannica Book of the year 2003, Encyclopædia Britannica Publishers, Chicago, 2002, page 779.〕 or ''misty window'', and more or less precise "guesstimates" are the only ''realistic'' present-day available possibilities. To make things more complicated, not all countries carry out censuses on a regular basis, especially some of the poorer, faster-growing sub-Saharan African nations (whose evolution may be more interesting, from a demographer's point of view, than the ''stagnated'' populations of countries like Germany or Italy). As it is widely known in the world of demographics (from historical empirical data), countries like those (along with other nations like Algeria, Bangladesh, Egypt, India, and Pakistan) -with their low family planning- tend to grow much faster than the aging European nations or Japan. In general, although the former countries may slow down their respective demographic growths rates in the decades to come, it is unlikely that they will stabilize their respective populations by 2050, as predicted by the IDB data in some cases; they may also stay near the relatively high average level of 1.5% increase per year. Something similar can be said about China, whose population is still growing at an absolute rate of ''some 10 million additional inhabitants per year'', despite its government’s efforts to stabilize it, through its one child per couple policy. On the other hand, some other countries, like the small Asian State of Bhutan, have only recently had a ''thorough'' census for the first time: In Bhutan's case in particular, before its national 2005 population survey,〔(Bhutan on the CityPopulation website ).〕〔(Bhutan on www.geohive.com )〕〔(Bhutan on Statoids.com )〕 the IDB showed an estimated 2+ million figure, which was silently reduced in a drastic way, after the new census results were finally included in its database. Besides, the IDB usually takes some time before including new data, as it happened in the case of Indonesia. That is why that country was reported by the IDB to have an ''inflated'' population of some 242 million by mid-2005, because it had not still processed the final results of the eventually ''moderate'' 2000 Indonesian census.〔(1971, 1980, 1990 and 2000 Indonesian censuses ) (and 1995 intercensus count), on the ''Badan Pusat Statistik'' (BPS, Statistics Indonesia) website.〕〔(Indonesia on CityPopulation ).〕〔(Indonesia on GeoHive.com )〕〔(Indonesia on Statoids )〕 A similar discrepancy has also occurred with the relatively recent Ethiopian 2007 census,〔(Ethiopia on CityPopulation )〕〔(Ethiopia on GeoHive )〕 that resulted in "only" 73,918,505 inhabitants (preliminary figure). The largest absolute potential discrepancies are naturally related to the most populous nations. However, smaller states, such as Tuvalu, can have large ''relative'' discrepancies. For instance, the 2002 census in that Oceanian island, which gave a final population of 9,561〔(Central Statistics Division - Government of Tuvalu - Census of Population and Housing and sample Surveys ), on the Pacific Regional Information System (PRISM), within the Secretariat of the Pacific Community (SPC) website.〕 shows that IDB estimates can be significantly off. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of countries by past, current and future population」の詳細全文を読む スポンサード リンク
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