-4.34% is the change from 921 to 881
Calculation steps:
[( 881 - 921 ) ÷ 921] x 100 = -4.34%
Formula
Percentage change = [(881 - 921) / 921] x 100
Subtract the new number by the original number
881 - 921 = -40
-40 ÷ 921 = -0.04343105320304017
-0.04343105320304017 x 100 = -4.34%