-2.27% is the change from 397 to 388
Calculation steps:
[( 388 - 397 ) ÷ 397] x 100 = -2.27%
Formula
Percentage change = [(388 - 397) / 397] x 100
Subtract the new number by the original number
388 - 397 = -9
-9 ÷ 397 = -0.022670025188916875
-0.022670025188916875 x 100 = -2.27%