To assess global trends, the Perceptions of Electoral Integrity expert survey monitors elections worldwide and regionally, across all stages of the electoral cycle.
This 2018 report describes the latest update of the Perceptions of Electoral Integrity dataset (PEI Release 6.0). The cumulative dataset is drawn from a survey of 3,253 expert assessment of electoral integrity across 285 elections in 164 countries around the world. The cumulative dataset covers national presidential and parliamentary elections from July 1, 2012 to December 31, 2017.
Norris, Pippa, Thomas Wynter, and Sarah Cameron. "Corruption and Coercion: The Year in Elections 2017." Electoral Integrity Project, March 2018.