-21.3% is the change from 878 to 691
Calculation steps:
[( 691 - 878 ) ÷ 878] x 100 = -21.3%
Formula
Percentage change = [(691 - 878) / 878] x 100
Subtract the new number by the original number
691 - 878 = -187
-187 ÷ 878 = -0.21298405466970388
-0.21298405466970388 x 100 = -21.3%