-62.83% is the change from 686 to 255
Calculation steps:
[( 255 - 686 ) ÷ 686] x 100 = -62.83%
Formula
Percentage change = [(255 - 686) / 686] x 100
Subtract the new number by the original number
255 - 686 = -431
-431 ÷ 686 = -0.6282798833819242
-0.6282798833819242 x 100 = -62.83%