-62.7% is the change from 858 to 320
Calculation steps:
[( 320 - 858 ) ÷ 858] x 100 = -62.7%
Formula
Percentage change = [(320 - 858) / 858] x 100
Subtract the new number by the original number
320 - 858 = -538
-538 ÷ 858 = -0.627039627039627
-0.627039627039627 x 100 = -62.7%