-0.77% is the change from 391 to 388
Calculation steps:
[( 388 - 391 ) ÷ 391] x 100 = -0.77%
Formula
Percentage change = [(388 - 391) / 391] x 100
Subtract the new number by the original number
388 - 391 = -3
-3 ÷ 391 = -0.0076726342710997444
-0.0076726342710997444 x 100 = -0.77%