-40.51% is the change from 669 to 398
Calculation steps:
[( 398 - 669 ) ÷ 669] x 100 = -40.51%
Formula
Percentage change = [(398 - 669) / 669] x 100
Subtract the new number by the original number
398 - 669 = -271
-271 ÷ 669 = -0.40508221225710017
-0.40508221225710017 x 100 = -40.51%