-39.74% is the change from 858 to 517
Calculation steps:
[( 517 - 858 ) ÷ 858] x 100 = -39.74%
Formula
Percentage change = [(517 - 858) / 858] x 100
Subtract the new number by the original number
517 - 858 = -341
-341 ÷ 858 = -0.3974358974358974
-0.3974358974358974 x 100 = -39.74%