-63.44% is the change from 878 to 321
Calculation steps:
[( 321 - 878 ) ÷ 878] x 100 = -63.44%
Formula
Percentage change = [(321 - 878) / 878] x 100
Subtract the new number by the original number
321 - 878 = -557
-557 ÷ 878 = -0.6343963553530751
-0.6343963553530751 x 100 = -63.44%