-96.31% is the change from 813 to 30
Calculation steps:
[( 30 - 813 ) ÷ 813] x 100 = -96.31%
Formula
Percentage change = [(30 - 813) / 813] x 100
Subtract the new number by the original number
30 - 813 = -783
-783 ÷ 813 = -0.9630996309963099
-0.9630996309963099 x 100 = -96.31%