-90.73% is the change from 917 to 85
Calculation steps:
[( 85 - 917 ) ÷ 917] x 100 = -90.73%
Formula
Percentage change = [(85 - 917) / 917] x 100
Subtract the new number by the original number
85 - 917 = -832
-832 ÷ 917 = -0.9073064340239912
-0.9073064340239912 x 100 = -90.73%