World Tax Revenue Chart
Current World Tax Revenue: 14.81% GDP
World Tax Revenue for Dec 2014
Mean: 14.35% GDP
Median: 14.29% GDP
Min: 13.29% GDP (Dec 1975)
Max: 16.02% GDP (Dec 2000)

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

Source: World Bank > World > World Tax Revenue