Fig. 10
From: World trend in energy: an extension to DEA applied to energy and environment
Source: IEA Photovoltaic Power Systems Programme, Trends 2014 in Photovoltaic Applications (IEA-PVPS T1-25: 2014) (http://www.iea-pvps.org/fileadmin/dam/public/report/statistics/IEA_PVPS_Trends_2014_in_PV_Applications_-_lr.pdf)
Cumulative Installed Photovoltaic Power from 1999 to 2013. We prepare the figure based upon the numbers listed in the data source. See Sueyoshi and Goto (2017). MW Megawatt.