Table:
Fiscal Year Ended August 31,

2019	2018	2017

Intrinsic value of SARS exercised	$335	$909	$5,053

Fair value of restricted stock units vested	$49,725	$62,592	$44,010

Tax benefit for stock compensation expense(1)	$611	$1,122	$560

Unrecognized stock-based compensation expense — restricted stock units	$41,778

Remaining weighted-average period for restricted stock units expense	1.3years

Answer the following question taking into account both the table and the accompanying 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).

Text:
The following table represents the restricted stock units and SARS stock-based compensation information for the periods indicated (in thousands):
(1) Classified as income tax expense within the Consolidated Statements of Operations.

Question: What was the percentage change in the Fair value of restricted stock units vested between 2018 and 2019?

(($49,725-$62,592)/$62,592) * 100, therefore {"answer": "-20.56", "scale": "percent"}