-53.17% is the change from 331 to 155
Calculation steps:
[( 155 - 331 ) ÷ 331] x 100 = -53.17%
Formula
Percentage change = [(155 - 331) / 331] x 100
Subtract the new number by the original number
155 - 331 = -176
-176 ÷ 331 = -0.5317220543806647
-0.5317220543806647 x 100 = -53.17%