-86.76% is the change from 136 to 18
Calculation steps:
[( 18 - 136 ) ÷ 136] x 100 = -86.76%
Formula
Percentage change = [(18 - 136) / 136] x 100
Subtract the new number by the original number
18 - 136 = -118
-118 ÷ 136 = -0.8676470588235294
-0.8676470588235294 x 100 = -86.76%