-20.74% is the change from 680 to 539
Calculation steps:
[( 539 - 680 ) ÷ 680] x 100 = -20.74%
Formula
Percentage change = [(539 - 680) / 680] x 100
Subtract the new number by the original number
539 - 680 = -141
-141 ÷ 680 = -0.2073529411764706
-0.2073529411764706 x 100 = -20.74%