-55.7% is the change from 921 to 408
Calculation steps:
[( 408 - 921 ) ÷ 921] x 100 = -55.7%
Formula
Percentage change = [(408 - 921) / 921] x 100
Subtract the new number by the original number
408 - 921 = -513
-513 ÷ 921 = -0.5570032573289903
-0.5570032573289903 x 100 = -55.7%