-99.64% is the change from 831 to 3
Calculation steps:
[( 3 - 831 ) ÷ 831] x 100 = -99.64%
Formula
Percentage change = [(3 - 831) / 831] x 100
Subtract the new number by the original number
3 - 831 = -828
-828 ÷ 831 = -0.9963898916967509
-0.9963898916967509 x 100 = -99.64%