-4.02% is the change from 323 to 310
Calculation steps:
[( 310 - 323 ) ÷ 323] x 100 = -4.02%
Formula
Percentage change = [(310 - 323) / 323] x 100
Subtract the new number by the original number
310 - 323 = -13
-13 ÷ 323 = -0.04024767801857585
-0.04024767801857585 x 100 = -4.02%