Table:
2019	2018

$’000	$’000

Accrued revenue	27,817	5,824

Unearned revenue	27,069	22,914

Answer the following question based on the provided table together with the text, respond with any necessary explanation, then provide the JSON object {"answer": ["ANSWER"], "scale": "SCALE"} as the final output (use an empty string for scale if irrelevant).

Context:
(iii) Contract balances
Increases in the balance of accrued and unearned revenue during the year relate to the acquisition of Sigma Systems (refer to Note 24). Additionally, the increase in accrued revenue was a result of software licences deployed on contract inception but have yet to be billed to the customer.
Revenues recognised in the current reporting period that was included in deferred revenue at the beginning of the reporting period was $22,251,000, representing support and maintenance performed during the period.

Question: How much was the difference in unearned revenue and accrued revenue in 2019?

27,817 - 27,069 , therefore {"answer": "748", "scale": "thousand"}