-18.66% is the change from 418 to 340
Calculation steps:
[( 340 - 418 ) ÷ 418] x 100 = -18.66%
Formula
Percentage change = [(340 - 418) / 418] x 100
Subtract the new number by the original number
340 - 418 = -78
-78 ÷ 418 = -0.18660287081339713
-0.18660287081339713 x 100 = -18.66%