-3.32% is the change from 391 to 378
Calculation steps:
[( 378 - 391 ) ÷ 391] x 100 = -3.32%
Formula
Percentage change = [(378 - 391) / 391] x 100
Subtract the new number by the original number
378 - 391 = -13
-13 ÷ 391 = -0.03324808184143223
-0.03324808184143223 x 100 = -3.32%