-17.54% is the change from 399 to 329
Calculation steps:
[( 329 - 399 ) ÷ 399] x 100 = -17.54%
Formula
Percentage change = [(329 - 399) / 399] x 100
Subtract the new number by the original number
329 - 399 = -70
-70 ÷ 399 = -0.17543859649122806
-0.17543859649122806 x 100 = -17.54%