-68.36% is the change from 809 to 256
Calculation steps:
[( 256 - 809 ) ÷ 809] x 100 = -68.36%
Formula
Percentage change = [(256 - 809) / 809] x 100
Subtract the new number by the original number
256 - 809 = -553
-553 ÷ 809 = -0.6835599505562423
-0.6835599505562423 x 100 = -68.36%