Changes

[[:file:St54Ch3Figure19.jpg|Figure 1]] depicts global oil production over a 50-year time span.

[[:file:St54Ch3Figure19.jpg|Figure 1]] depicts global oil production over a 50-year time span.

[[file:St54Ch3Figure19.jpg|thumb|300px|{{figure number|1}}World yearly oil production from 1950 to 2002. Data as reported by the [http://www.ogj.com/index.html Oil & Gas Journal]. FSU = former Soviet Union; OPEC = Organization of Petroleum Exporting Countries. From Salvador.<ref name=Salvador_2005>Salvador, Amos, 2005, Energy-A historical perspective and 21st century forecast: AAPG Studies in Geology 54, 208 p.</ref>]]

[[file:St54Ch3Figure19.jpg|thumb|300px|{{figure number|1}}World yearly oil production from 1950 to 2002. Data as reported by the [http://www.ogj.com/index.html Oil & Gas Journal]. FSU = former Soviet Union; OPEC = Organization of Petroleum Exporting Countries. From Salvador.<ref name=Salvador_2005>Salvador, A., 2005, Energy-A historical perspective and 21st century forecast: AAPG Studies in Geology 54, 208 p.</ref>]]

At the start of the 21st century, the 10 principal oil producers were, in descending order (with approximate percentages of the total world oil production):

At the start of the 21st century, the 10 principal oil producers were, in descending order (with approximate percentages of the total world oil production):