-89.69% is the change from 834 to 86
Calculation steps:
[( 86 - 834 ) ÷ 834] x 100 = -89.69%
Formula
Percentage change = [(86 - 834) / 834] x 100
Subtract the new number by the original number
86 - 834 = -748
-748 ÷ 834 = -0.8968824940047961
-0.8968824940047961 x 100 = -89.69%