-77.21% is the change from 136 to 31
Calculation steps:
[( 31 - 136 ) ÷ 136] x 100 = -77.21%
Formula
Percentage change = [(31 - 136) / 136] x 100
Subtract the new number by the original number
31 - 136 = -105
-105 ÷ 136 = -0.7720588235294118
-0.7720588235294118 x 100 = -77.21%