-9.36% is the change from 641 to 581
Calculation steps:
[( 581 - 641 ) ÷ 641] x 100 = -9.36%
Formula
Percentage change = [(581 - 641) / 641] x 100
Subtract the new number by the original number
581 - 641 = -60
-60 ÷ 641 = -0.093603744149766
-0.093603744149766 x 100 = -9.36%