Knoema数据库中关于趋势行业，政治和社会经济主题的快速数据摘要和可视化。US Purchasing Managers Index Falls Below 50, Signals Contraction US Agricultural Exports to China Falling, Farmers Seek New Markets United States: Higher Education Costs Flat in 2018 了解更多
The sources for this database are mainly census data, from the 2000 round of censuses. Census data were used for 22 countries. Countries not taking periodic censuses but keeping population registers have provided data extracted from these registers; this is the case for four countries: Denmark, Finland, Norway and Sweden. For some countries, not all themes covered in the database are present in the national census or register. Labour force surveys, provided by Eurostat and averaged over the period 1998-2002, have been used to fill the gaps where possible. The exact national source and reference period for each file is given in Table A.1 (see the methodological document).