-69.94% is the change from 855 to 257
Calculation steps:
[( 257 - 855 ) ÷ 855] x 100 = -69.94%
Formula
Percentage change = [(257 - 855) / 855] x 100
Subtract the new number by the original number
257 - 855 = -598
-598 ÷ 855 = -0.6994152046783626
-0.6994152046783626 x 100 = -69.94%