-3.38% is the change from 355 to 343
Calculation steps:
[( 343 - 355 ) ÷ 355] x 100 = -3.38%
Formula
Percentage change = [(343 - 355) / 355] x 100
Subtract the new number by the original number
343 - 355 = -12
-12 ÷ 355 = -0.03380281690140845
-0.03380281690140845 x 100 = -3.38%