-8.42% is the change from 677 to 620
Calculation steps:
[( 620 - 677 ) ÷ 677] x 100 = -8.42%
Formula
Percentage change = [(620 - 677) / 677] x 100
Subtract the new number by the original number
620 - 677 = -57
-57 ÷ 677 = -0.08419497784342689
-0.08419497784342689 x 100 = -8.42%