-66.9% is the change from 858 to 284
Calculation steps:
[( 284 - 858 ) ÷ 858] x 100 = -66.9%
Formula
Percentage change = [(284 - 858) / 858] x 100
Subtract the new number by the original number
284 - 858 = -574
-574 ÷ 858 = -0.668997668997669
-0.668997668997669 x 100 = -66.9%