Google: Try a scoped Google search to limit results to types of organizations that might collection this type of data. Example:
Statista: Data on a wide range of topics, from thousands of institutions and sources. It provides access to data from market and opinion research institutions, as well as from business organizations and government agencies.
OECD Data Explorer: Statistics and reports from OECD member countries, covering topics like health, education, environment, economics and more.
World Bank Open Data: A variety of country-level statistics and development indicators about people, economics, environment, infrastructure and technology.
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