3.3% is the change from 909 to 939
Calculation steps:
[( 939 - 909 ) ÷ 909] x 100 = 3.3%
Formula
Percentage change = [(939 - 909) / 909] x 100
Subtract the new number by the original number
939 - 909 = 30
30 ÷ 909 = 0.033003300330033
0.033003300330033 x 100 = 3.3%