NOTE 2 – BUSINESS COMBINATIONS continued  NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS  Since the acquisition date of 8 March 2013 through 31 December 2013, the Company has earned revenue of $42.3  million and generated net income of $12.6 million. The following reflects the acquisition’s contribution to the Group  as if the merger had occurred on 1 January 2013 instead of the closing date of 8 March 2013 (in thousands, except  per share information):  The Company incurred $0.2 and $0.5 million for the years ended 31 December 2014 and 2013, respectively, for  professional fees and services related to the Texon acquisition. These amounts are included in general and  administrative expense in the consolidated statements of profit or loss, and other comprehensive income and  financing activities in the consolidated statement of cash flows, respectively.  2014 2013 Year ended 31 December  US$’000 US$’000 Oil revenue   144,994  79,365  Natural gas revenue  6,161  2,774  Natural gas liquid (NGL) revenue  8,638  3,206  Total revenue (net of royalties and transportation costs)  159,793  85,345  NOTE 3 – REVENUE NOTE 4 – LEASE OPERATING AND PRODUCTION TAX EXPENSE  2014 2013 Year ended 31 December  US$’000 US$’000 Lease operating expense  (12,466)  (11,378)  Workover expense  (1,058)  (743)  Production tax expense  (6,965)  (6,262)  Total lease operating and production tax expense  (20,489) (18,383)  - 74 -  Year ended 31 December 2013  Oil and natural gas revenue  $ 5,163  Lease operating and production expenses  (1,150)  Depreciation and amortization expense (1,882)  General and administrative expense (667)  Finance costs  (35)  Profit before income tax  1,429  Income tax expense  (542)  Proforma profit attributable to the period 1 January to 7 March 2013  887  Profit attributable to owners of the Company for the year 15,942  Adjusted profit attributable to the owners of the Company for the year  $ 16,829  Adjusted basic earnings per ordinary share  4.1 ₵  Adjusted diluted earnings per ordinary share  4.0