-42.18% is the change from 671 to 388
Calculation steps:
[( 388 - 671 ) ÷ 671] x 100 = -42.18%
Formula
Percentage change = [(388 - 671) / 671] x 100
Subtract the new number by the original number
388 - 671 = -283
-283 ÷ 671 = -0.4217585692995529
-0.4217585692995529 x 100 = -42.18%