-4.68% is the change from 620 to 591
Calculation steps:
[( 591 - 620 ) ÷ 620] x 100 = -4.68%
Formula
Percentage change = [(591 - 620) / 620] x 100
Subtract the new number by the original number
591 - 620 = -29
-29 ÷ 620 = -0.0467741935483871
-0.0467741935483871 x 100 = -4.68%