-94.26% is the change from 680 to 39
Calculation steps:
[( 39 - 680 ) ÷ 680] x 100 = -94.26%
Formula
Percentage change = [(39 - 680) / 680] x 100
Subtract the new number by the original number
39 - 680 = -641
-641 ÷ 680 = -0.9426470588235294
-0.9426470588235294 x 100 = -94.26%