-28.28% is the change from 891 to 639
Calculation steps:
[( 639 - 891 ) ÷ 891] x 100 = -28.28%
Formula
Percentage change = [(639 - 891) / 891] x 100
Subtract the new number by the original number
639 - 891 = -252
-252 ÷ 891 = -0.2828282828282828
-0.2828282828282828 x 100 = -28.28%