-85.78% is the change from 921 to 131
Calculation steps:
[( 131 - 921 ) ÷ 921] x 100 = -85.78%
Formula
Percentage change = [(131 - 921) / 921] x 100
Subtract the new number by the original number
131 - 921 = -790
-790 ÷ 921 = -0.8577633007600435
-0.8577633007600435 x 100 = -85.78%