-70.27% is the change from 861 to 256
Calculation steps:
[( 256 - 861 ) ÷ 861] x 100 = -70.27%
Formula
Percentage change = [(256 - 861) / 861] x 100
Subtract the new number by the original number
256 - 861 = -605
-605 ÷ 861 = -0.70267131242741
-0.70267131242741 x 100 = -70.27%