-56.89% is the change from 921 to 397
Calculation steps:
[( 397 - 921 ) ÷ 921] x 100 = -56.89%
Formula
Percentage change = [(397 - 921) / 921] x 100
Subtract the new number by the original number
397 - 921 = -524
-524 ÷ 921 = -0.5689467969598263
-0.5689467969598263 x 100 = -56.89%