-0.28% is the change from 723 to 721
Calculation steps:
[( 721 - 723 ) ÷ 723] x 100 = -0.28%
Formula
Percentage change = [(721 - 723) / 723] x 100
Subtract the new number by the original number
721 - 723 = -2
-2 ÷ 723 = -0.0027662517289073307
-0.0027662517289073307 x 100 = -0.28%