-69.78% is the change from 857 to 259
Calculation steps:
[( 259 - 857 ) ÷ 857] x 100 = -69.78%
Formula
Percentage change = [(259 - 857) / 857] x 100
Subtract the new number by the original number
259 - 857 = -598
-598 ÷ 857 = -0.6977829638273045
-0.6977829638273045 x 100 = -69.78%