-88.45% is the change from 857 to 99
Calculation steps:
[( 99 - 857 ) ÷ 857] x 100 = -88.45%
Formula
Percentage change = [(99 - 857) / 857] x 100
Subtract the new number by the original number
99 - 857 = -758
-758 ÷ 857 = -0.8844807467911319
-0.8844807467911319 x 100 = -88.45%