-30.51% is the change from 331 to 230
Calculation steps:
[( 230 - 331 ) ÷ 331] x 100 = -30.51%
Formula
Percentage change = [(230 - 331) / 331] x 100
Subtract the new number by the original number
230 - 331 = -101
-101 ÷ 331 = -0.30513595166163143
-0.30513595166163143 x 100 = -30.51%