-15.55% is the change from 643 to 543
Calculation steps:
[( 543 - 643 ) ÷ 643] x 100 = -15.55%
Formula
Percentage change = [(543 - 643) / 643] x 100
Subtract the new number by the original number
543 - 643 = -100
-100 ÷ 643 = -0.15552099533437014
-0.15552099533437014 x 100 = -15.55%