-4.46% is the change from 673 to 643
Calculation steps:
[( 643 - 673 ) ÷ 673] x 100 = -4.46%
Formula
Percentage change = [(643 - 673) / 673] x 100
Subtract the new number by the original number
643 - 673 = -30
-30 ÷ 673 = -0.04457652303120357
-0.04457652303120357 x 100 = -4.46%