-99.7% is the change from 993 to 3
Calculation steps:
[( 3 - 993 ) ÷ 993] x 100 = -99.7%
Formula
Percentage change = [(3 - 993) / 993] x 100
Subtract the new number by the original number
3 - 993 = -990
-990 ÷ 993 = -0.9969788519637462
-0.9969788519637462 x 100 = -99.7%