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The text mentions population - related data. In historical context, the population growth trend in the Qing dynasty reflects social and economic changes. The rise from several hundred thousands to four to five million at its development apex shows a period of relative stability and prosperity, which might be related to factors like agricultural development, policy adjustments, and reduced warfare. Demographic changes in the Qing dynasty also have an impact on subsequent social structures, such as land distribution, labor force, and tax systems.