-53.2% is the change from 921 to 431
Calculation steps:
[( 431 - 921 ) ÷ 921] x 100 = -53.2%
Formula
Percentage change = [(431 - 921) / 921] x 100
Subtract the new number by the original number
431 - 921 = -490
-490 ÷ 921 = -0.5320304017372421
-0.5320304017372421 x 100 = -53.2%