-3.35% is the change from 239 to 231
Calculation steps:
[( 231 - 239 ) ÷ 239] x 100 = -3.35%
Formula
Percentage change = [(231 - 239) / 239] x 100
Subtract the new number by the original number
231 - 239 = -8
-8 ÷ 239 = -0.03347280334728033
-0.03347280334728033 x 100 = -3.35%