-4.04% is the change from 915 to 878
Calculation steps:
[( 878 - 915 ) ÷ 915] x 100 = -4.04%
Formula
Percentage change = [(878 - 915) / 915] x 100
Subtract the new number by the original number
878 - 915 = -37
-37 ÷ 915 = -0.040437158469945354
-0.040437158469945354 x 100 = -4.04%