-1.31% is the change from 915 to 903
Calculation steps:
[( 903 - 915 ) ÷ 915] x 100 = -1.31%
Formula
Percentage change = [(903 - 915) / 915] x 100
Subtract the new number by the original number
903 - 915 = -12
-12 ÷ 915 = -0.013114754098360656
-0.013114754098360656 x 100 = -1.31%