-2.9% is the change from 621 to 603
Calculation steps:
[( 603 - 621 ) ÷ 621] x 100 = -2.9%
Formula
Percentage change = [(603 - 621) / 621] x 100
Subtract the new number by the original number
603 - 621 = -18
-18 ÷ 621 = -0.028985507246376812
-0.028985507246376812 x 100 = -2.9%