-0.93% is the change from 858 to 850
Calculation steps:
[( 850 - 858 ) ÷ 858] x 100 = -0.93%
Formula
Percentage change = [(850 - 858) / 858] x 100
Subtract the new number by the original number
850 - 858 = -8
-8 ÷ 858 = -0.009324009324009324
-0.009324009324009324 x 100 = -0.93%