24. | Administrative expenses |
| | 2017 | | 2016 | | 2015 | | |||
| | US$(000) | | US$(000) | | US$(000) | | |||
| | | | | | | | | | |
Personnel expenses | | | 36,265 | | | 29,617 | | | 33,036 | |
Sundry charges | | | 12,510 | | | 15,531 | | | 21,248 | |
Professional fees | | | 12,663 | | | 11,696 | | | 10,364 | |
Rentals | | | 5,412 | | | 4,870 | | | 4,009 | |
Insurance | | | 3,911 | | | 3,023 | | | 5,105 | |
Donations | | | 3,006 | | | 4,280 | | | 3,336 | |
Maintenance and repairs | | | 2,657 | | | 1,076 | | | 973 | |
Subscriptions and quotes | | | 1,428 | | | 697 | | | 540 | |
Board of Directors’ participation | | | 1,422 | | | 1,140 | | | 1,055 | |
Communications | | | 1,376 | | | 1,557 | | | 1,281 | |
Travel and mobility | | | 1,053 | | | 914 | | | 787 | |
Allowance for doubtful accounts, note 7(f) | | | 676 | | | 5,087 | | | 903 | |
Consumption of materials and supplies | | | 616 | | | 416 | | | 1,032 | |
Canons and tributes | | | 602 | | | 1,460 | | | 824 | |
Provision (reversal) of stock appreciation’s rights | | | - | | | 328 | | | (121) | |
| | | 83,597 | | | 81,692 | | | 84,372 | |