-3.42% is the change from 351 to 339
Calculation steps:
[( 339 - 351 ) ÷ 351] x 100 = -3.42%
Formula
Percentage change = [(339 - 351) / 351] x 100
Subtract the new number by the original number
339 - 351 = -12
-12 ÷ 351 = -0.03418803418803419
-0.03418803418803419 x 100 = -3.42%