-3.06% is the change from 915 to 887
Calculation steps:
[( 887 - 915 ) ÷ 915] x 100 = -3.06%
Formula
Percentage change = [(887 - 915) / 915] x 100
Subtract the new number by the original number
887 - 915 = -28
-28 ÷ 915 = -0.030601092896174863
-0.030601092896174863 x 100 = -3.06%