-69.13% is the change from 839 to 259
Calculation steps:
[( 259 - 839 ) ÷ 839] x 100 = -69.13%
Formula
Percentage change = [(259 - 839) / 839] x 100
Subtract the new number by the original number
259 - 839 = -580
-580 ÷ 839 = -0.6912991656734208
-0.6912991656734208 x 100 = -69.13%