-68.55% is the change from 814 to 256
Calculation steps:
[( 256 - 814 ) ÷ 814] x 100 = -68.55%
Formula
Percentage change = [(256 - 814) / 814] x 100
Subtract the new number by the original number
256 - 814 = -558
-558 ÷ 814 = -0.6855036855036855
-0.6855036855036855 x 100 = -68.55%