-6.44% is the change from 621 to 581
Calculation steps:
[( 581 - 621 ) ÷ 621] x 100 = -6.44%
Formula
Percentage change = [(581 - 621) / 621] x 100
Subtract the new number by the original number
581 - 621 = -40
-40 ÷ 621 = -0.0644122383252818
-0.0644122383252818 x 100 = -6.44%