-21.62% is the change from 643 to 504
Calculation steps:
[( 504 - 643 ) ÷ 643] x 100 = -21.62%
Formula
Percentage change = [(504 - 643) / 643] x 100
Subtract the new number by the original number
504 - 643 = -139
-139 ÷ 643 = -0.2161741835147745
-0.2161741835147745 x 100 = -21.62%