-27.9% is the change from 319 to 230
Calculation steps:
[( 230 - 319 ) ÷ 319] x 100 = -27.9%
Formula
Percentage change = [(230 - 319) / 319] x 100
Subtract the new number by the original number
230 - 319 = -89
-89 ÷ 319 = -0.27899686520376177
-0.27899686520376177 x 100 = -27.9%