-5.07% is the change from 671 to 637
Calculation steps:
[( 637 - 671 ) ÷ 671] x 100 = -5.07%
Formula
Percentage change = [(637 - 671) / 671] x 100
Subtract the new number by the original number
637 - 671 = -34
-34 ÷ 671 = -0.05067064083457526
-0.05067064083457526 x 100 = -5.07%