-90.09% is the change from 868 to 86
Calculation steps:
[( 86 - 868 ) ÷ 868] x 100 = -90.09%
Formula
Percentage change = [(86 - 868) / 868] x 100
Subtract the new number by the original number
86 - 868 = -782
-782 ÷ 868 = -0.9009216589861752
-0.9009216589861752 x 100 = -90.09%