-15.72% is the change from 407 to 343
Calculation steps:
[( 343 - 407 ) ÷ 407] x 100 = -15.72%
Formula
Percentage change = [(343 - 407) / 407] x 100
Subtract the new number by the original number
343 - 407 = -64
-64 ÷ 407 = -0.15724815724815724
-0.15724815724815724 x 100 = -15.72%