-40.83% is the change from 671 to 397
Calculation steps:
[( 397 - 671 ) ÷ 671] x 100 = -40.83%
Formula
Percentage change = [(397 - 671) / 671] x 100
Subtract the new number by the original number
397 - 671 = -274
-274 ÷ 671 = -0.4083457526080477
-0.4083457526080477 x 100 = -40.83%