-99.5% is the change from 997 to 5
Calculation steps:
[( 5 - 997 ) ÷ 997] x 100 = -99.5%
Formula
Percentage change = [(5 - 997) / 997] x 100
Subtract the new number by the original number
5 - 997 = -992
-992 ÷ 997 = -0.9949849548645938
-0.9949849548645938 x 100 = -99.5%