-0.49% is the change from 612 to 609
Calculation steps:
[( 609 - 612 ) ÷ 612] x 100 = -0.49%
Formula
Percentage change = [(609 - 612) / 612] x 100
Subtract the new number by the original number
609 - 612 = -3
-3 ÷ 612 = -0.004901960784313725
-0.004901960784313725 x 100 = -0.49%