-3.09% is the change from 938 to 909
Calculation steps:
[( 909 - 938 ) ÷ 938] x 100 = -3.09%
Formula
Percentage change = [(909 - 938) / 938] x 100
Subtract the new number by the original number
909 - 938 = -29
-29 ÷ 938 = -0.03091684434968017
-0.03091684434968017 x 100 = -3.09%