-8.55% is the change from 678 to 620
Calculation steps:
[( 620 - 678 ) ÷ 678] x 100 = -8.55%
Formula
Percentage change = [(620 - 678) / 678] x 100
Subtract the new number by the original number
620 - 678 = -58
-58 ÷ 678 = -0.0855457227138643
-0.0855457227138643 x 100 = -8.55%