Table:
|  | Years ended |  |
| --- | --- | --- |
|  | December 31, 2019 | December 31, 2018 |
|  | $ | $ |
| Current portion | 56,691 | 39,180 |
| Long term portion | 5,969 | 1,881 |
|  | 62,660 | 41,061 |
Paragraphs:
Deferred Revenue
The opening balances of current and long-term deferred revenue were $30,694 and $1,352, respectively, as of January 1, 2018.
Expressed in US $000's except share and per share amounts
Question:
How much has long-term deferred revenue changed from January 1, 2018 to December 31, 2018?
Answer: 1881-1352 = 529