-22.24% is the change from 643 to 500
Calculation steps:
[( 500 - 643 ) ÷ 643] x 100 = -22.24%
Formula
Percentage change = [(500 - 643) / 643] x 100
Subtract the new number by the original number
500 - 643 = -143
-143 ÷ 643 = -0.2223950233281493
-0.2223950233281493 x 100 = -22.24%