-94.16% is the change from 668 to 39
Calculation steps:
[( 39 - 668 ) ÷ 668] x 100 = -94.16%
Formula
Percentage change = [(39 - 668) / 668] x 100
Subtract the new number by the original number
39 - 668 = -629
-629 ÷ 668 = -0.9416167664670658
-0.9416167664670658 x 100 = -94.16%