-16.87% is the change from 409 to 340
Calculation steps:
[( 340 - 409 ) ÷ 409] x 100 = -16.87%
Formula
Percentage change = [(340 - 409) / 409] x 100
Subtract the new number by the original number
340 - 409 = -69
-69 ÷ 409 = -0.1687041564792176
-0.1687041564792176 x 100 = -16.87%