-34.28% is the change from 668 to 439
Calculation steps:
[( 439 - 668 ) ÷ 668] x 100 = -34.28%
Formula
Percentage change = [(439 - 668) / 668] x 100
Subtract the new number by the original number
439 - 668 = -229
-229 ÷ 668 = -0.34281437125748504
-0.34281437125748504 x 100 = -34.28%