-68.41% is the change from 820 to 259
Calculation steps:
[( 259 - 820 ) ÷ 820] x 100 = -68.41%
Formula
Percentage change = [(259 - 820) / 820] x 100
Subtract the new number by the original number
259 - 820 = -561
-561 ÷ 820 = -0.6841463414634147
-0.6841463414634147 x 100 = -68.41%