-16.38% is the change from 409 to 342
Calculation steps:
[( 342 - 409 ) ÷ 409] x 100 = -16.38%
Formula
Percentage change = [(342 - 409) / 409] x 100
Subtract the new number by the original number
342 - 409 = -67
-67 ÷ 409 = -0.16381418092909536
-0.16381418092909536 x 100 = -16.38%