-86.39% is the change from 999 to 136
Calculation steps:
[( 136 - 999 ) ÷ 999] x 100 = -86.39%
Formula
Percentage change = [(136 - 999) / 999] x 100
Subtract the new number by the original number
136 - 999 = -863
-863 ÷ 999 = -0.8638638638638638
-0.8638638638638638 x 100 = -86.39%