(€ million)

2017

2016

2015

Revenues related to exploration activity and evaluation

9

4

68

Exploration activity and evaluation costs

- write-off of exploration and evaluation costs

252

170

617

- other exploration costs

273

204

254

Exploration expense for the year

525

374

871

Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs

995

1,092

735

Tangible assets: capitalized exploration and evaluation costs

1,860

2,818

2,637

Total tangible and intangible assets

2,855

3,910

3,372

Provision for decommissioning related to exploration activity

and evaluation

81

118

131

Exploration expenditure (net cash used in investing activivties)

442

417

566

Geological and geophysical costs (cash flow from operating activities)

273

204

254

Total exploration effort

715

621

820