-99.5% is the change from 397 to 2
Calculation steps:
[( 2 - 397 ) ÷ 397] x 100 = -99.5%
Formula
Percentage change = [(2 - 397) / 397] x 100
Subtract the new number by the original number
2 - 397 = -395
-395 ÷ 397 = -0.9949622166246851
-0.9949622166246851 x 100 = -99.5%