Primary Energy Oil Price GNP Year Linear Log Linear Linear Log Linear Linear Log Linear 2000 .87 .92 .89 .90 .98 .99 2025 .69 .89 .66 .80 .89 .94 2050 .59 .87 .52 .75 .77 .90 2075 .45 .86 .37 .77 .65 .87