-5.21% is the change from 326 to 309
Calculation steps:
[( 309 - 326 ) ÷ 326] x 100 = -5.21%
Formula
Percentage change = [(309 - 326) / 326] x 100
Subtract the new number by the original number
309 - 326 = -17
-17 ÷ 326 = -0.05214723926380368
-0.05214723926380368 x 100 = -5.21%