-39.63% is the change from 858 to 518
Calculation steps:
[( 518 - 858 ) ÷ 858] x 100 = -39.63%
Formula
Percentage change = [(518 - 858) / 858] x 100
Subtract the new number by the original number
518 - 858 = -340
-340 ÷ 858 = -0.3962703962703963
-0.3962703962703963 x 100 = -39.63%