text: **Income taxes.**The components of our provision for income taxes are as follows: 
  
  **Year ended 31 December**
  
  **2014** **2013** **(In US$‘000s)**
  
  Current tax (expense)/benefit .....................................................................  (17)  21,398 
  
  Deferred tax benefit/(expense) ...................................................................   858   (26,965) 
  
  Total income tax benefit/(expense) .............................................................  841  (5,567) 
  
  Combined Federal and state effective tax rate  (5.8)%  25.9% 
  
  Our combined Federal and state effective tax rates differ from the Group’s statutory tax rate of 30% primarily due to US federal 
  and state tax rates, non-deductible expenses and the recognition of previously unrecognised tax losses. See Note 7 in the Notes 
  to the Consolidated Financial Statements of this report for further information regarding our income taxes. 
  
  **Adjusted EBITDAX**. Adjusted EBITDAX is defined as earnings before interest expense, income taxes, depreciation, depletion 
  and amortisation, property impairments, gain/(loss) on sale of non-current assets, exploration expense, share-based 
  compensation and gains and losses on commodity hedging, net of settlements of commodity hedging. 
  
  For the year ended 31 December 2014, adjusted EBITDAX was $126.4 million, or 79% of revenue, compared to $52.6 million, 
  or 62% of revenue, from the prior year. 