-5.49% is the change from 328 to 310
Calculation steps:
[( 310 - 328 ) ÷ 328] x 100 = -5.49%
Formula
Percentage change = [(310 - 328) / 328] x 100
Subtract the new number by the original number
310 - 328 = -18
-18 ÷ 328 = -0.054878048780487805
-0.054878048780487805 x 100 = -5.49%