-8.71% is the change from 643 to 587
Calculation steps:
[( 587 - 643 ) ÷ 643] x 100 = -8.71%
Formula
Percentage change = [(587 - 643) / 643] x 100
Subtract the new number by the original number
587 - 643 = -56
-56 ÷ 643 = -0.08709175738724728
-0.08709175738724728 x 100 = -8.71%