-2.3% is the change from 738 to 721
Calculation steps:
[( 721 - 738 ) ÷ 738] x 100 = -2.3%
Formula
Percentage change = [(721 - 738) / 738] x 100
Subtract the new number by the original number
721 - 738 = -17
-17 ÷ 738 = -0.023035230352303523
-0.023035230352303523 x 100 = -2.3%