-89.35% is the change from 930 to 99
Calculation steps:
[( 99 - 930 ) ÷ 930] x 100 = -89.35%
Formula
Percentage change = [(99 - 930) / 930] x 100
Subtract the new number by the original number
99 - 930 = -831
-831 ÷ 930 = -0.8935483870967742
-0.8935483870967742 x 100 = -89.35%