-9.21% is the change from 391 to 355
Calculation steps:
[( 355 - 391 ) ÷ 391] x 100 = -9.21%
Formula
Percentage change = [(355 - 391) / 391] x 100
Subtract the new number by the original number
355 - 391 = -36
-36 ÷ 391 = -0.09207161125319693
-0.09207161125319693 x 100 = -9.21%