-5.61% is the change from 677 to 639
Calculation steps:
[( 639 - 677 ) ÷ 677] x 100 = -5.61%
Formula
Percentage change = [(639 - 677) / 677] x 100
Subtract the new number by the original number
639 - 677 = -38
-38 ÷ 677 = -0.056129985228951254
-0.056129985228951254 x 100 = -5.61%