-18.99% is the change from 158 to 128
Calculation steps:
[( 128 - 158 ) ÷ 158] x 100 = -18.99%
Formula
Percentage change = [(128 - 158) / 158] x 100
Subtract the new number by the original number
128 - 158 = -30
-30 ÷ 158 = -0.189873417721519
-0.189873417721519 x 100 = -18.99%