World Tax Revenue Chart
Current World Tax Revenue: 14.38% GDP
World Tax Revenue for Dec 2012
Mean: 14.40% GDP
Median: 14.50% GDP
Min: 13.34% GDP (Dec 2009)
Max: 16.06% GDP (Dec 2000)

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

Source: World Bank > World > World Tax Revenue