-50.49% is the change from 921 to 456
Calculation steps:
[( 456 - 921 ) ÷ 921] x 100 = -50.49%
Formula
Percentage change = [(456 - 921) / 921] x 100
Subtract the new number by the original number
456 - 921 = -465
-465 ÷ 921 = -0.504885993485342
-0.504885993485342 x 100 = -50.49%