-16.29% is the change from 921 to 771
Calculation steps:
[( 771 - 921 ) ÷ 921] x 100 = -16.29%
Formula
Percentage change = [(771 - 921) / 921] x 100
Subtract the new number by the original number
771 - 921 = -150
-150 ÷ 921 = -0.16286644951140064
-0.16286644951140064 x 100 = -16.29%