-90.71% is the change from 861 to 80
Calculation steps:
[( 80 - 861 ) ÷ 861] x 100 = -90.71%
Formula
Percentage change = [(80 - 861) / 861] x 100
Subtract the new number by the original number
80 - 861 = -781
-781 ÷ 861 = -0.9070847851335656
-0.9070847851335656 x 100 = -90.71%