Oil is the greatest source of primary energy supplied worldwide. In 2019, 30.9 percent of all energy produced in the world was oil-based. In 1973, this share stood at close to 50 percent. In the years since, the shares of natural gas and nuclear energy have seen the most pronounced growth.
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IEA. (September 1, 2021). Distribution of primary energy supply worldwide in 1973 and 2019, by source [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 19, 2026, from /statistics/270528/global-energy-supply-by-source/
IEA. "Distribution of primary energy supply worldwide in 1973 and 2019, by source." Chart. September 1, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 19, 2026. /statistics/270528/global-energy-supply-by-source/
IEA. (2021). Distribution of primary energy supply worldwide in 1973 and 2019, by source. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 19, 2026. /statistics/270528/global-energy-supply-by-source/
IEA. "Distribution of Primary Energy Supply Worldwide in 1973 and 2019, by Source." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 1 Sep 2021, /statistics/270528/global-energy-supply-by-source/
IEA, Distribution of primary energy supply worldwide in 1973 and 2019, by source ÌÇÐÄÆƽâ°æ, /statistics/270528/global-energy-supply-by-source/ (last visited July 19, 2026)
Distribution of primary energy supply worldwide in 1973 and 2019, by source [Graph], IEA, September 1, 2021. [Online]. Available: /statistics/270528/global-energy-supply-by-source/
