-99.3% is the change from 857 to 6
Calculation steps:
[( 6 - 857 ) ÷ 857] x 100 = -99.3%
Formula
Percentage change = [(6 - 857) / 857] x 100
Subtract the new number by the original number
6 - 857 = -851
-851 ÷ 857 = -0.9929988331388565
-0.9929988331388565 x 100 = -99.3%