-16.17% is the change from 643 to 539
Calculation steps:
[( 539 - 643 ) ÷ 643] x 100 = -16.17%
Formula
Percentage change = [(539 - 643) / 643] x 100
Subtract the new number by the original number
539 - 643 = -104
-104 ÷ 643 = -0.16174183514774496
-0.16174183514774496 x 100 = -16.17%