-99.88% is the change from 857 to 1
Calculation steps:
[( 1 - 857 ) ÷ 857] x 100 = -99.88%
Formula
Percentage change = [(1 - 857) / 857] x 100
Subtract the new number by the original number
1 - 857 = -856
-856 ÷ 857 = -0.9988331388564761
-0.9988331388564761 x 100 = -99.88%