€ / mln 2016 2015
Revenue 5,484 5,304
Toll revenue 4,009 3,836
Airport service revenues 636 565
Other operating income and contract revenue 839 903
Gross operating profit (EBITDA) 3,378 3,215
Gross operating profit (EBITDA) adjusted (a) 3,469 3,301
Operating profit (EBIT) 2,315   2,212
Profit before tax from continuing operations 1,776 1,438
Profit for the year 1,238 975
Profit for the year attributable to owners of the parent 1,122 853
FFO- Operating cash flow (b) 2,400 2,105
FFO- Operating cash flow adjusted (a) 2,439 2,138
Capital expenditure (c) 1,422 1,488
Equity 10,009 8,483
Equity attributable to owners of the parent 7,224 6,800
Net debt 11,677 10,387
Net debt adjusted (a) 12,823 11,490

(a) Adjusted amounts have been presented with the aim of enabling analysts and the rating agencies to assess the Group’s results of operations and financial position using the basis of presentation normally adopted by them.

(b) Operating cash flow is calculated as profit for the year + amortisation/depreciation +/- impairments/reversals of impairments of assets +/- provisions/releases of provisions + other adjustments + financial expenses from discounting of provisions +/- share of profit/(loss) of investees accounted for using equity method +/- (losses)/gains on sale of assets +/- other non-cash items +/- net deferred tax assets/liabilities recognised in profit or loss.

 (c) The figure includes investment in assets held under concession, in property, plant and equipment and in intangible assets.