-70.45% is the change from 863 to 255
Calculation steps:
[( 255 - 863 ) ÷ 863] x 100 = -70.45%
Formula
Percentage change = [(255 - 863) / 863] x 100
Subtract the new number by the original number
255 - 863 = -608
-608 ÷ 863 = -0.7045191193511008
-0.7045191193511008 x 100 = -70.45%