World Tax Revenue Chart
Current World Tax Revenue: 15.82% GDP
World Tax Revenue for Dec 2015
Mean: 16.16% GDP
Median: 14.78% GDP
Min: 13.28% GDP (Dec 2009)
Max: 29.67% GDP (Dec 1989)

World tax revenue (percent of GDP). Excludes most social security contributions.

Source: World Bank > World > World Tax Revenue