-68.57% is the change from 821 to 258
Calculation steps:
[( 258 - 821 ) ÷ 821] x 100 = -68.57%
Formula
Percentage change = [(258 - 821) / 821] x 100
Subtract the new number by the original number
258 - 821 = -563
-563 ÷ 821 = -0.6857490864799025
-0.6857490864799025 x 100 = -68.57%