-22.96% is the change from 331 to 255
Calculation steps:
[( 255 - 331 ) ÷ 331] x 100 = -22.96%
Formula
Percentage change = [(255 - 331) / 331] x 100
Subtract the new number by the original number
255 - 331 = -76
-76 ÷ 331 = -0.229607250755287
-0.229607250755287 x 100 = -22.96%