-70.62% is the change from 868 to 255
Calculation steps:
[( 255 - 868 ) ÷ 868] x 100 = -70.62%
Formula
Percentage change = [(255 - 868) / 868] x 100
Subtract the new number by the original number
255 - 868 = -613
-613 ÷ 868 = -0.706221198156682
-0.706221198156682 x 100 = -70.62%