Table:
December 31, 2019	December 31,2018

Accounts receivable	$68,309	$76,376

Less: provision for doubtful receivables	(16,377)	(16,086)

Accounts receivable, net	$51,932	$60,290

Answer the following question leveraging the tabular data along with the context text, feel free to explain how you reached the answer, then present the result in JSON format {"answer": ["ANSWER"], "scale": "SCALE"} (leave scale empty if none).

Context:
NAVIOS MARITIME HOLDINGS INC. NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Expressed in thousands of U.S. dollars — except share data)
NOTE 5: ACCOUNTS RECEIVABLE, NET
Accounts receivable consisted of the following:

Question: What was the percentage change in net accounts receivables between 2018 and 2019?

((51,932-60,290)/60,290) * 100, therefore {"answer": "-13.86", "scale": "percent"}