1.21% is the change from 909 to 920
Calculation steps:
[( 920 - 909 ) ÷ 909] x 100 = 1.21%
Formula
Percentage change = [(920 - 909) / 909] x 100
Subtract the new number by the original number
920 - 909 = 11
11 ÷ 909 = 0.0121012101210121
0.0121012101210121 x 100 = 1.21%