-22.36% is the change from 331 to 257
Calculation steps:
[( 257 - 331 ) ÷ 331] x 100 = -22.36%
Formula
Percentage change = [(257 - 331) / 331] x 100
Subtract the new number by the original number
257 - 331 = -74
-74 ÷ 331 = -0.22356495468277945
-0.22356495468277945 x 100 = -22.36%