-81.01% is the change from 158 to 30
Calculation steps:
[( 30 - 158 ) ÷ 158] x 100 = -81.01%
Formula
Percentage change = [(30 - 158) / 158] x 100
Subtract the new number by the original number
30 - 158 = -128
-128 ÷ 158 = -0.810126582278481
-0.810126582278481 x 100 = -81.01%