-8.69% is the change from 679 to 620
Calculation steps:
[( 620 - 679 ) ÷ 679] x 100 = -8.69%
Formula
Percentage change = [(620 - 679) / 679] x 100
Subtract the new number by the original number
620 - 679 = -59
-59 ÷ 679 = -0.08689248895434462
-0.08689248895434462 x 100 = -8.69%