The chart below shows a population-weighted history of the past two millennia.
下表展示了过去两千年以来按人口加权的历史。
2
The data were weighted to ensure that the sample's composition reflects that of the actual U.S. population according to U.S. Census figures.
调查根据美国人口普查的数据进行加权处理，以确保样本组成能够代表美国实际人口组成。
3
The survey was carried out by Harris Interactive. Datawas weighted to be representative of the total US population based onregion, age, gender, education, household, income, and race。