-1.09% is the change from 915 to 905
Calculation steps:
[( 905 - 915 ) ÷ 915] x 100 = -1.09%
Formula
Percentage change = [(905 - 915) / 915] x 100
Subtract the new number by the original number
905 - 915 = -10
-10 ÷ 915 = -0.01092896174863388
-0.01092896174863388 x 100 = -1.09%