-8.58% is the change from 641 to 586
Calculation steps:
[( 586 - 641 ) ÷ 641] x 100 = -8.58%
Formula
Percentage change = [(586 - 641) / 641] x 100
Subtract the new number by the original number
586 - 641 = -55
-55 ÷ 641 = -0.08580343213728549
-0.08580343213728549 x 100 = -8.58%