-69.7% is the change from 878 to 266
Calculation steps:
[( 266 - 878 ) ÷ 878] x 100 = -69.7%
Formula
Percentage change = [(266 - 878) / 878] x 100
Subtract the new number by the original number
266 - 878 = -612
-612 ÷ 878 = -0.6970387243735763
-0.6970387243735763 x 100 = -69.7%