Fig. 1
From: World trend in energy: an extension to DEA applied to energy and environment
Source: BP Statistical Review of World Energy (2014) (http://www.bp.com/en/global/corporate/about-bp/energy-economics/statistical-review-of-world-energy/statistical-review-downloads.html)
Trend of World primary energy consumption. We prepare the figure based upon the numbers listed in the data source. See Sueyoshi and Goto (2017). A large increase in energy consumption can be found in the Asia-Pacific region during the observed decades. An increase can be found in Europe and Eurasia, as well. A rapid economic development has been accomplished in the two regions.