-17.11% is the change from 409 to 339
Calculation steps:
[( 339 - 409 ) ÷ 409] x 100 = -17.11%
Formula
Percentage change = [(339 - 409) / 409] x 100
Subtract the new number by the original number
339 - 409 = -70
-70 ÷ 409 = -0.17114914425427874
-0.17114914425427874 x 100 = -17.11%