-6.26% is the change from 878 to 823
Calculation steps:
[( 823 - 878 ) ÷ 878] x 100 = -6.26%
Formula
Percentage change = [(823 - 878) / 878] x 100
Subtract the new number by the original number
823 - 878 = -55
-55 ÷ 878 = -0.06264236902050115
-0.06264236902050115 x 100 = -6.26%