-81.13% is the change from 159 to 30
Calculation steps:
[( 30 - 159 ) ÷ 159] x 100 = -81.13%
Formula
Percentage change = [(30 - 159) / 159] x 100
Subtract the new number by the original number
30 - 159 = -129
-129 ÷ 159 = -0.8113207547169812
-0.8113207547169812 x 100 = -81.13%