-64.1% is the change from 858 to 308
Calculation steps:
[( 308 - 858 ) ÷ 858] x 100 = -64.1%
Formula
Percentage change = [(308 - 858) / 858] x 100
Subtract the new number by the original number
308 - 858 = -550
-550 ÷ 858 = -0.6410256410256411
-0.6410256410256411 x 100 = -64.1%