-4.83% is the change from 621 to 591
Calculation steps:
[( 591 - 621 ) ÷ 621] x 100 = -4.83%
Formula
Percentage change = [(591 - 621) / 621] x 100
Subtract the new number by the original number
591 - 621 = -30
-30 ÷ 621 = -0.04830917874396135
-0.04830917874396135 x 100 = -4.83%