adding energy efficiency Kaya factor FE/GDP_PPP, and denoting old FE/… #495
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…GDP by FE/GDP_MER
Source: The Flaw of One Price: Some Implications For MER-PPP Discussions by Alan Heston
mattermost discussion: https://mattermost.pik-potsdam.de/rd3/pl/9jtu99bhztdijjffpd5esekqte