-89.58% is the change from 873 to 91
Calculation steps:
[( 91 - 873 ) ÷ 873] x 100 = -89.58%
Formula
Percentage change = [(91 - 873) / 873] x 100
Subtract the new number by the original number
91 - 873 = -782
-782 ÷ 873 = -0.8957617411225659
-0.8957617411225659 x 100 = -89.58%