| | | 12-31-2017 | |
| | | Present Value | |
| Periods | | ThU.S.$ | |
| Less than one year | | 44,341 | |
| Between one and five years | | 68,035 | |
| More than five years | | - | |
| Total | | 112,376 | |
| | | 12-31-2016 | |
| | | Present Value | |
| Periods | | ThU.S.$ | |
| Less than one year | | 40,400 | |
| Between one and five years | | 73,586 | |
| More than five years | | - | |
| Total | | 113,986 | |