-6.08% is the change from 329 to 309
Calculation steps:
[( 309 - 329 ) ÷ 329] x 100 = -6.08%
Formula
Percentage change = [(309 - 329) / 329] x 100
Subtract the new number by the original number
309 - 329 = -20
-20 ÷ 329 = -0.060790273556231005
-0.060790273556231005 x 100 = -6.08%