-49.42% is the change from 858 to 434
Calculation steps:
[( 434 - 858 ) ÷ 858] x 100 = -49.42%
Formula
Percentage change = [(434 - 858) / 858] x 100
Subtract the new number by the original number
434 - 858 = -424
-424 ÷ 858 = -0.49417249417249415
-0.49417249417249415 x 100 = -49.42%