-19.8% is the change from 409 to 328
Calculation steps:
[( 328 - 409 ) ÷ 409] x 100 = -19.8%
Formula
Percentage change = [(328 - 409) / 409] x 100
Subtract the new number by the original number
328 - 409 = -81
-81 ÷ 409 = -0.1980440097799511
-0.1980440097799511 x 100 = -19.8%