-99.39% is the change from 990 to 6
Calculation steps:
[( 6 - 990 ) ÷ 990] x 100 = -99.39%
Formula
Percentage change = [(6 - 990) / 990] x 100
Subtract the new number by the original number
6 - 990 = -984
-984 ÷ 990 = -0.9939393939393939
-0.9939393939393939 x 100 = -99.39%