Data for Europe and Japan from OECD Economic Outlook, No. 74, December 2003, for Canada from Statistics Canada (census population and National Income and Expenditure Accounts GDP) and for the United States from census population and National Income and Product Accounts GDP.
Statistique Canada, recensement de la population et Comptes nationaux des revenus et dépenses (PIB); États-Unis : recensement de la population et National Income and Product Accounts (PIB)