-6.61% is the change from 620 to 579
Calculation steps:
[( 579 - 620 ) ÷ 620] x 100 = -6.61%
Formula
Percentage change = [(579 - 620) / 620] x 100
Subtract the new number by the original number
579 - 620 = -41
-41 ÷ 620 = -0.06612903225806452
-0.06612903225806452 x 100 = -6.61%