-8.58% is the change from 921 to 842
Calculation steps:
[( 842 - 921 ) ÷ 921] x 100 = -8.58%
Formula
Percentage change = [(842 - 921) / 921] x 100
Subtract the new number by the original number
842 - 921 = -79
-79 ÷ 921 = -0.08577633007600434
-0.08577633007600434 x 100 = -8.58%