-7.18% is the change from 878 to 815
Calculation steps:
[( 815 - 878 ) ÷ 878] x 100 = -7.18%
Formula
Percentage change = [(815 - 878) / 878] x 100
Subtract the new number by the original number
815 - 878 = -63
-63 ÷ 878 = -0.07175398633257403
-0.07175398633257403 x 100 = -7.18%