-62.59% is the change from 858 to 321
Calculation steps:
[( 321 - 858 ) ÷ 858] x 100 = -62.59%
Formula
Percentage change = [(321 - 858) / 858] x 100
Subtract the new number by the original number
321 - 858 = -537
-537 ÷ 858 = -0.6258741258741258
-0.6258741258741258 x 100 = -62.59%