-39.98% is the change from 858 to 515
Calculation steps:
[( 515 - 858 ) ÷ 858] x 100 = -39.98%
Formula
Percentage change = [(515 - 858) / 858] x 100
Subtract the new number by the original number
515 - 858 = -343
-343 ÷ 858 = -0.3997668997668998
-0.3997668997668998 x 100 = -39.98%
Example