-99.4% is the change from 993 to 6
Calculation steps:
[( 6 - 993 ) ÷ 993] x 100 = -99.4%
Formula
Percentage change = [(6 - 993) / 993] x 100
Subtract the new number by the original number
6 - 993 = -987
-987 ÷ 993 = -0.9939577039274925
-0.9939577039274925 x 100 = -99.4%