-94.19% is the change from 671 to 39
Calculation steps:
[( 39 - 671 ) ÷ 671] x 100 = -94.19%
Formula
Percentage change = [(39 - 671) / 671] x 100
Subtract the new number by the original number
39 - 671 = -632
-632 ÷ 671 = -0.9418777943368107
-0.9418777943368107 x 100 = -94.19%