-50.81% is the change from 921 to 453
Calculation steps:
[( 453 - 921 ) ÷ 921] x 100 = -50.81%
Formula
Percentage change = [(453 - 921) / 921] x 100
Subtract the new number by the original number
453 - 921 = -468
-468 ÷ 921 = -0.50814332247557
-0.50814332247557 x 100 = -50.81%