results and statistics for the years ended December 31, 2017, 2016 and 2015 are included in the following tables: Year Ended December 31, 2017 Equity Method Investment-Equatorial Kosmos Guinea(1) Total (In thousands, except per barrel data) Sales volumes: Jubilee . . . . . . . . . . . . . . . . . . . . . . . . 7,782 — 7,782 TEN . . . . . . . . . . . . . . . . . . . . . . . . . . 2,979 — 2,979 Ceiba / Okume . . . . . . . . . . . . . . . . . . — 405 405 10,761 405 11,166 Revenues: Oil sales . . . . . . . . . . . . . . . . . . . . . . . $578,139 $27,307 $605,446 Average sales price per Bbl . . . . . . . . . . . 53.73 67.42 54.22 Costs: Oil production, excluding workovers . . . $121,429 $ 7,755 $129,184 Oil production, workovers . . . . . . . . . . 5,421 — 5,421 Total oil production costs . . . . . . . . . $126,850 $ 7,755 $134,605 Depletion and depreciation . . . . . . . . . $255,203 $11,181 $266,384 Average cost per Bbl: Oil production, excluding workovers . . . $ 11.28 $ 19.15 $ 11.57 Oil production, workovers . . . . . . . . . . 0.50 — 0.48 Total oil production costs . . . . . . . . . 11.78 19.15 12.05 Depletion and depreciation . . . . . . . . . 23.72 27.61 23.86 Oil production cost and depletion costs . $ 35.50 $ 46.76 $ 35.91 (1) For the year ended December 31, 2017, we have presented our 50% share of the results of operations from the date of acquisition, November 28, 2017 through December 31, 2017. Under the equity method of accounting, we only recognize our share of the net 84