-68.31% is the change from 811 to 257
Calculation steps:
[( 257 - 811 ) ÷ 811] x 100 = -68.31%
Formula
Percentage change = [(257 - 811) / 811] x 100
Subtract the new number by the original number
257 - 811 = -554
-554 ÷ 811 = -0.6831072749691739
-0.6831072749691739 x 100 = -68.31%
Example