-19.19% is the change from 344 to 278
Calculation steps:
[( 278 - 344 ) ÷ 344] x 100 = -19.19%
Formula
Percentage change = [(278 - 344) / 344] x 100
Subtract the new number by the original number
278 - 344 = -66
-66 ÷ 344 = -0.19186046511627908
-0.19186046511627908 x 100 = -19.19%