-3.09% is the change from 906 to 878
Calculation steps:
[( 878 - 906 ) ÷ 906] x 100 = -3.09%
Formula
Percentage change = [(878 - 906) / 906] x 100
Subtract the new number by the original number
878 - 906 = -28
-28 ÷ 906 = -0.03090507726269316
-0.03090507726269316 x 100 = -3.09%