-27.58% is the change from 939 to 680
Calculation steps:
[( 680 - 939 ) ÷ 939] x 100 = -27.58%
Formula
Percentage change = [(680 - 939) / 939] x 100
Subtract the new number by the original number
680 - 939 = -259
-259 ÷ 939 = -0.27582534611288606
-0.27582534611288606 x 100 = -27.58%