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Salient features - Other financial information (Details) R in Millions | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 ZAR (R) $ / bbl employee R / $ | Dec. 31, 2017 ZAR (R) $ / bbl employee R / $ | Jun. 30, 2018 ZAR (R) $ / bbl employee R / $ | Dec. 31, 2018 R / € | Dec. 31, 2018 R / $ | Dec. 31, 2018 ZAR (R) | Jun. 30, 2018 R / € | Jun. 30, 2018 R / $ | Jun. 30, 2018 ZAR (R) | Dec. 31, 2017 R / € | Dec. 31, 2017 R / $ | Dec. 31, 2017 ZAR (R)
Other financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt (including bank overdraft) |  |  |  |  |  |  | R 131,578 |  |  | R 111,489 |  |  | R 96,119
Interest-bearing debt |  |  |  |  |  |  | 130,800 |  |  | 110,052 |  |  | 94,952
Non-interest-bearing debt |  |  |  |  |  |  | 778 |  |  | 1,437 |  |  | 1,167
Finance expense capitalised | [1] | R 3,440 | R 1,634 | R 3,568 |  |  |  |  |  |  |  |  |
Guarantees (excluding treasury facilities) |  |  |  |  |  |  |  |  |  |  |  |  |
maximum potential exposure |  |  |  |  |  |  | 77,469 |  |  | 80,260 |  |  | 75,528
related debt recognised on the balance sheet |  |  |  |  |  |  | 74,328 |  |  | 76,199 |  |  | 70,676
Effective tax rate |  | 24.10% | 31.60% | 35.40% |  |  |  |  |  |  |  |  |
Adjusted effective tax rate | [2] | 29.00% | 26.40% | 27.30% |  |  |  |  |  |  |  |  |
Number of employees | employee | [3] | 31,430 | 31,000 | 31,270 |  |  |  |  |  |  |  |  |
Average crude oil price - dated Brent | $ / bbl |  | 71.33 | 56.74 | 63.62 |  |  |  |  |  |  |  |  |
Average foreign exchange rate | R / $ |  | 14.20 | 13.40 | 12.85 |  |  |  |  |  |  |  |  |
Closing foreign exchange rate |  |  |  |  | 16.47 | 14.36 |  | 16.04 | 13.73 |  | 14.84 | 12.37 |
Subsidiaries and joint operations |  |  |  |  |  |  |  |  |  |  |  |  |
Other financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital commitments |  |  |  |  |  |  | 58,640 |  |  | 63,276 |  |  | 69,813
Authorised and contracted |  |  |  |  |  |  | 187,515 |  |  | 179,172 |  |  | 150,520
Authorised, not yet contracted |  |  |  |  |  |  | 40,555 |  |  | 40,687 |  |  | 46,322
less expenditure to date |  |  |  |  |  |  | (169,430) |  |  | (156,583) |  |  | (127,029)
Equity accounted investments |  |  |  |  |  |  |  |  |  |  |  |  |
Other financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital commitments |  |  |  |  |  |  | 1,018 |  |  | 893 |  |  | 717
Authorised and contracted |  |  |  |  |  |  | 618 |  |  | 536 |  |  | 404
Authorised, not yet contracted |  |  |  |  |  |  | 620 |  |  | 623 |  |  | 652
less expenditure to date |  |  |  |  |  |  | R (220) |  |  | R (266) |  |  | R (339)
[1] | Finance expense capitalised increased due to the adoption of the amendment to IAS 23 'Borrowing Costs' on 1 July 2018.
[2] | Effective tax rate adjusted for equity accounted investments, remeasurement items and once-off items.
[3] | The total number of employees includes permanent and non-permanent employees and the group’s share of employees within joint operations, but excludes contractors and equity accounted investments’ employees.

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