-26.94% is the change from 939 to 686
Calculation steps:
[( 686 - 939 ) ÷ 939] x 100 = -26.94%
Formula
Percentage change = [(686 - 939) / 939] x 100
Subtract the new number by the original number
686 - 939 = -253
-253 ÷ 939 = -0.26943556975505856
-0.26943556975505856 x 100 = -26.94%