-68.48% is the change from 809 to 255
Calculation steps:
[( 255 - 809 ) ÷ 809] x 100 = -68.48%
Formula
Percentage change = [(255 - 809) / 809] x 100
Subtract the new number by the original number
255 - 809 = -554
-554 ÷ 809 = -0.6847960444993819
-0.6847960444993819 x 100 = -68.48%