-98.88% is the change from 806 to 9
Calculation steps:
[( 9 - 806 ) ÷ 806] x 100 = -98.88%
Formula
Percentage change = [(9 - 806) / 806] x 100
Subtract the new number by the original number
9 - 806 = -797
-797 ÷ 806 = -0.988833746898263
-0.988833746898263 x 100 = -98.88%