-99.88% is the change from 831 to 1
Calculation steps:
[( 1 - 831 ) ÷ 831] x 100 = -99.88%
Formula
Percentage change = [(1 - 831) / 831] x 100
Subtract the new number by the original number
1 - 831 = -830
-830 ÷ 831 = -0.9987966305655837
-0.9987966305655837 x 100 = -99.88%