-5.03% is the change from 398 to 378
Calculation steps:
[( 378 - 398 ) ÷ 398] x 100 = -5.03%
Formula
Percentage change = [(378 - 398) / 398] x 100
Subtract the new number by the original number
378 - 398 = -20
-20 ÷ 398 = -0.05025125628140704
-0.05025125628140704 x 100 = -5.03%