-42.32% is the change from 671 to 387
Calculation steps:
[( 387 - 671 ) ÷ 671] x 100 = -42.32%
Formula
Percentage change = [(387 - 671) / 671] x 100
Subtract the new number by the original number
387 - 671 = -284
-284 ÷ 671 = -0.4232488822652757
-0.4232488822652757 x 100 = -42.32%