| (i) | The credit risk on cash and cash equivalents, marketable securities, restricted cash and derivative financial instruments are determined by rating instruments widely accepted by the market and are arranged as follows: |
| December 31, 2017 |
December 31, 2016 |
|||||||
|
AAA |
3,499,345 | — | ||||||
|
AA |
6,159,553 | 5,499,565 | ||||||
|
A |
— | 983,384 | ||||||
|
B |
2,007 | — | ||||||
|
BB+ |
4,180 | — | ||||||
|
BBB |
— | 260,298 | ||||||
|
|
|
|
|
|||||
| 9,665,085 | 6,743,247 | |||||||
|
|
|
|
|
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