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Statistics are available from many sources discussed elsewhere in ths guide: government agencies, IOGs, NGOs, charitable organizations, researchers, etc.
Be aware that types, extent, and dates of data are not always consistent between countries.
Within any individual country, the collection of data and reporting of statistics may change over time, be inconsistent across different parts of the country, or be disrupted by events such as war, natural disaster, or change in leadership.
Consider what government agency, organization, or other group may be collecting data and statistics on a particular topic and then search that institution's website.