-42.15% is the change from 688 to 398
Calculation steps:
[( 398 - 688 ) ÷ 688] x 100 = -42.15%
Formula
Percentage change = [(398 - 688) / 688] x 100
Subtract the new number by the original number
398 - 688 = -290
-290 ÷ 688 = -0.42151162790697677
-0.42151162790697677 x 100 = -42.15%