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From the International Institute for Democracy and Electoral Assistance (IDEA), depicts democratic trends at the country, regional and global levels across a broad range of different attributes of democracy from 1975–2017.
The indices present data for 158 countries around the world and consist of 5 main democracy attributes and 16 subattribute scores per country per year.

Varieties of Democracy (V-Dem) is a new approach to conceptualizing and measuring democracy. We provide a multidimensional and disaggregated dataset that reflects the complexity of the concept of democracy as a system of rule that goes beyond the simple presence of elections. The V-Dem project distinguishes between seven high-level principles of democracy: electoral, liberal, participatory, deliberative, egalitarian, majoritarian and consensual, and collects data to measure these principles.

The Polity conceptual scheme is unique in that it examines concomitant qualities of democratic and autocratic authority in governing institutions, rather than discreet and mutually exclusive forms of governance. This perspective envisions a spectrum of governing authority that spans from fully institutionalized autocracies through mixed, or incoherent, authority regimes (termed "anocracies") to fully institutionalized democracies. Scroll down the page to find the data downloads.

Survey of 100 countries gathering information on economic development, democratization, religion, gender, well-being, and other topics. Coverage 1981-2014.

Includes a wide range of international statistics collected by the United Nations and related organizations.