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+GCAM variable,output variable,aggregation keys,aggregation function,start year,end year,filters,output units
+Population,Population,,,2000,2050,,thous
+pcGDP(PPP),GDP|PPP,,,2000,2050,,Thous80US$/per
+Electricity,Electricity|Generation,,,2000,2050,(matches; sector; electricity),MWh
+Electricity,Electricity|Total,,,2000,2050,,
+Electricity,Electricity|Rooftop PV,,,2000,2050,(matches; sector; elect_td_bld),MWh
+Electricity,Electricity|Rooftop PV|Ridiculous,,,2000,2050,"(notmatches; sector; electricity), (notmatches; sector; industrial energy use)",MWh