-52.87% is the change from 331 to 156
Calculation steps:
[( 156 - 331 ) ÷ 331] x 100 = -52.87%
Formula
Percentage change = [(156 - 331) / 331] x 100
Subtract the new number by the original number
156 - 331 = -175
-175 ÷ 331 = -0.5287009063444109
-0.5287009063444109 x 100 = -52.87%