-8.16% is the change from 343 to 315
Calculation steps:
[( 315 - 343 ) ÷ 343] x 100 = -8.16%
Formula
Percentage change = [(315 - 343) / 343] x 100
Subtract the new number by the original number
315 - 343 = -28
-28 ÷ 343 = -0.08163265306122448
-0.08163265306122448 x 100 = -8.16%