-3.45% is the change from 348 to 336
Calculation steps:
[( 336 - 348 ) ÷ 348] x 100 = -3.45%
Formula
Percentage change = [(336 - 348) / 348] x 100
Subtract the new number by the original number
336 - 348 = -12
-12 ÷ 348 = -0.034482758620689655
-0.034482758620689655 x 100 = -3.45%