2.51% is the change from 915 to 938
Calculation steps:
[( 938 - 915 ) ÷ 915] x 100 = 2.51%
Formula
Percentage change = [(938 - 915) / 915] x 100
Subtract the new number by the original number
938 - 915 = 23
23 ÷ 915 = 0.025136612021857924
0.025136612021857924 x 100 = 2.51%