-22.4% is the change from 643 to 499
Calculation steps:
[( 499 - 643 ) ÷ 643] x 100 = -22.4%
Formula
Percentage change = [(499 - 643) / 643] x 100
Subtract the new number by the original number
499 - 643 = -144
-144 ÷ 643 = -0.223950233281493
-0.223950233281493 x 100 = -22.4%