-48.1% is the change from 921 to 478
Calculation steps:
[( 478 - 921 ) ÷ 921] x 100 = -48.1%
Formula
Percentage change = [(478 - 921) / 921] x 100
Subtract the new number by the original number
478 - 921 = -443
-443 ÷ 921 = -0.4809989142236699
-0.4809989142236699 x 100 = -48.1%