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The U.S. and World Population Clock presents the United States Census Bureau's continuously active approximations of both the population of the United States and the world's total population. The population totals are based on the latest census information and national population estimates, which are used in the algorithms that run the two clocks. Current value is . ==Calculation== The calculation used to estimate the approximate timely population is; one birth per time ''TW'' - one death per time ''TX'' + one international immigrant per time ''TY'' = overall increase (one person per time ''TZ''). 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「U.S. and World Population Clock」の詳細全文を読む スポンサード リンク
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