-27.45% is the change from 878 to 637
Calculation steps:
[( 637 - 878 ) ÷ 878] x 100 = -27.45%
Formula
Percentage change = [(637 - 878) / 878] x 100
Subtract the new number by the original number
637 - 878 = -241
-241 ÷ 878 = -0.2744874715261959
-0.2744874715261959 x 100 = -27.45%