b'method investment generating revenues with operations offshore Equatorial Guinea. The followingtable provides a summary of certain key 2018 data for our geographic areas.Percentage ofYear-End TotalSales Volumes Percentage of Estimated Estimated(Net to Total Sales Proved ProvedGeographic Area Kosmos) Volumes Revenue Reserves(1) Reserves(in MMboe) (in thousands) (in MMboe)Ghana . . . . . . . . . . . . . . . . . . . . . 10.7 58% $ 739,070 89.7 54%U.S. Gulf of Mexico(2) . . . . . . . . . 2.6 14 147,596 51.1 30Total Kosmos . . . . . . . . . . . . . . . 13.3 886,666 140.8Equatorial Guinea(3). . . . . . . . . . . 5.2 28 360,650 26.6 16Total . . . . . . . . . . . . . . . . . . . . . 18.5 100% 1,247,316 167.4 100%(1) For information concerning our estimated proved reserves as of December 31, 2018, see OurReserves.(2) Represents contributions from the U.S. Gulf of Mexico after the acquisition date.(3) Includes our 50% share from our equity method investment in Equatorial Guinea. Under theequity method of accounting, we only recognize our share of the net income of KTIPI as adjustedfor our basis differential, which is recorded in (Gain) loss on equity method investments, net in theconsolidated statement of operations. Effective as of January 1, 2019, our equity methodinvestment in Equatorial Guinea was converted to an undivided interest in Block G.13'