-15.86% is the change from 643 to 541
Calculation steps:
[( 541 - 643 ) ÷ 643] x 100 = -15.86%
Formula
Percentage change = [(541 - 643) / 643] x 100
Subtract the new number by the original number
541 - 643 = -102
-102 ÷ 643 = -0.15863141524105753
-0.15863141524105753 x 100 = -15.86%