-9.51% is the change from 673 to 609
Calculation steps:
[( 609 - 673 ) ÷ 673] x 100 = -9.51%
Formula
Percentage change = [(609 - 673) / 673] x 100
Subtract the new number by the original number
609 - 673 = -64
-64 ÷ 673 = -0.0950965824665676
-0.0950965824665676 x 100 = -9.51%