-99.7% is the change from 997 to 3
Calculation steps:
[( 3 - 997 ) ÷ 997] x 100 = -99.7%
Formula
Percentage change = [(3 - 997) / 997] x 100
Subtract the new number by the original number
3 - 997 = -994
-994 ÷ 997 = -0.9969909729187563
-0.9969909729187563 x 100 = -99.7%