-21.75% is the change from 878 to 687
Calculation steps:
[( 687 - 878 ) ÷ 878] x 100 = -21.75%
Formula
Percentage change = [(687 - 878) / 878] x 100
Subtract the new number by the original number
687 - 878 = -191
-191 ÷ 878 = -0.21753986332574032
-0.21753986332574032 x 100 = -21.75%