-26.73% is the change from 939 to 688
Calculation steps:
[( 688 - 939 ) ÷ 939] x 100 = -26.73%
Formula
Percentage change = [(688 - 939) / 939] x 100
Subtract the new number by the original number
688 - 939 = -251
-251 ÷ 939 = -0.2673056443024494
-0.2673056443024494 x 100 = -26.73%