-62.68% is the change from 686 to 256
Calculation steps:
[( 256 - 686 ) ÷ 686] x 100 = -62.68%
Formula
Percentage change = [(256 - 686) / 686] x 100
Subtract the new number by the original number
256 - 686 = -430
-430 ÷ 686 = -0.6268221574344023
-0.6268221574344023 x 100 = -62.68%