^Index of Economic Freedom （页面存档备份，存于互联网档案馆）, 美国传统基金会. Note: Tax revenue as a percentage of GDP was obtained from the individual country pages, under the "Fiscal Freedom" section. These numbers change. Please update the numbers for individual countries in the list.
^Total tax revenue as percentage of GDP （页面存档备份，存于互联网档案馆）. Table, 1965 to 2009 (it does not have each year). OECD (Organisation for Economic Co-operation and Development). Publication date: December 15, 2010. To view the .xls table you can use the free Excel Viewer （页面存档备份，存于互联网档案馆）. Most of the data is for 2009 and is provisional. 2008 data is shown for Australia, Japan, Netherlands, Poland and Portugal. The table is from the 2010 edition of the OECD book, Revenue Statistics （页面存档备份，存于互联网档案馆）. See the bottom of the page for links to editions for various years.
^Data from World Heritage Foundation 2013: [1] （页面存档备份，存于互联网档案馆）. Heritage Foundation.
^For info see the "fiscal freedom" section of this page: "Timor-Leste information on economic freedom. Facts, data, analysis, charts and more" （页面存档备份，存于互联网档案馆）. By the Heritage Foundation. "Timor-Leste has low taxes. The top income and corporate tax rates are 10 percent. In the most recent year, overall tax revenue as a percentage of non-oil GDP was 133.9 percent, reflecting large tax revenues from petroleum projects in the Timor Sea."
Tax revenue as an automatic fiscal stabiliser - a South African perspective. September 2002. By A.S. Swanepoel (South African Reserve Bank), and Nicolaas J. Schoeman (Department of Economics, 比勒陀利亚大学). South African Journal of Economic and Management Sciences (SAJEMS). See table 2 on page 576. Total taxes of 26.4% of GDP in 2001. Research Repository of the University of Pretoria, South Africa: [2]
Tax-to-GDP ratio stands at 10pc（页面存档备份，存于互联网档案馆）. By Mubarak Zeb Khan. June 11, 2008. Dawn (Pakistan's oldest, and most widely-read English-language newspaper). Total taxes of 10% of GDP in 2007.
