-9.08% is the change from 639 to 581
Calculation steps:
[( 581 - 639 ) ÷ 639] x 100 = -9.08%
Formula
Percentage change = [(581 - 639) / 639] x 100
Subtract the new number by the original number
581 - 639 = -58
-58 ÷ 639 = -0.09076682316118936
-0.09076682316118936 x 100 = -9.08%