-98.6% is the change from 857 to 12
Calculation steps:
[( 12 - 857 ) ÷ 857] x 100 = -98.6%
Formula
Percentage change = [(12 - 857) / 857] x 100
Subtract the new number by the original number
12 - 857 = -845
-845 ÷ 857 = -0.9859976662777129
-0.9859976662777129 x 100 = -98.6%