-65.57% is the change from 668 to 230
Calculation steps:
[( 230 - 668 ) ÷ 668] x 100 = -65.57%
Formula
Percentage change = [(230 - 668) / 668] x 100
Subtract the new number by the original number
230 - 668 = -438
-438 ÷ 668 = -0.655688622754491
-0.655688622754491 x 100 = -65.57%