there are a lot of them. Try Transparency International's Corruption Perceptions Index (CPI) and Global Corruption Barometer Survey (GCB); World Bank's Control of Corruption (CC), Worldwide Governance Indicators(WGI), Global Integrity Index, Global Competitiveness Report and a host of others.
Worldbank allows to download what they call "Governance Indicators". One of them is corruption data. You can access and download. https://databank.worldbank.org/reports.aspx?source=worldwide-governance-indicators