-68.3% is the change from 817 to 259
Calculation steps:
[( 259 - 817 ) ÷ 817] x 100 = -68.3%
Formula
Percentage change = [(259 - 817) / 817] x 100
Subtract the new number by the original number
259 - 817 = -558
-558 ÷ 817 = -0.6829865361077111
-0.6829865361077111 x 100 = -68.3%