-21.64% is the change from 878 to 688
Calculation steps:
[( 688 - 878 ) ÷ 878] x 100 = -21.64%
Formula
Percentage change = [(688 - 878) / 878] x 100
Subtract the new number by the original number
688 - 878 = -190
-190 ÷ 878 = -0.2164009111617312
-0.2164009111617312 x 100 = -21.64%