-0.25% is the change from 397 to 396
Calculation steps:
[( 396 - 397 ) ÷ 397] x 100 = -0.25%
Formula
Percentage change = [(396 - 397) / 397] x 100
Subtract the new number by the original number
396 - 397 = -1
-1 ÷ 397 = -0.0025188916876574307
-0.0025188916876574307 x 100 = -0.25%