-80.38% is the change from 158 to 31
Calculation steps:
[( 31 - 158 ) ÷ 158] x 100 = -80.38%
Formula
Percentage change = [(31 - 158) / 158] x 100
Subtract the new number by the original number
31 - 158 = -127
-127 ÷ 158 = -0.8037974683544303
-0.8037974683544303 x 100 = -80.38%