-52.57% is the change from 331 to 157
Calculation steps:
[( 157 - 331 ) ÷ 331] x 100 = -52.57%
Formula
Percentage change = [(157 - 331) / 331] x 100
Subtract the new number by the original number
157 - 331 = -174
-174 ÷ 331 = -0.525679758308157
-0.525679758308157 x 100 = -52.57%