-90.24% is the change from 861 to 84
Calculation steps:
[( 84 - 861 ) ÷ 861] x 100 = -90.24%
Formula
Percentage change = [(84 - 861) / 861] x 100
Subtract the new number by the original number
84 - 861 = -777
-777 ÷ 861 = -0.9024390243902439
-0.9024390243902439 x 100 = -90.24%