-8.09% is the change from 643 to 591
Calculation steps:
[( 591 - 643 ) ÷ 643] x 100 = -8.09%
Formula
Percentage change = [(591 - 643) / 643] x 100
Subtract the new number by the original number
591 - 643 = -52
-52 ÷ 643 = -0.08087091757387248
-0.08087091757387248 x 100 = -8.09%