-99.63% is the change from 813 to 3
Calculation steps:
[( 3 - 813 ) ÷ 813] x 100 = -99.63%
Formula
Percentage change = [(3 - 813) / 813] x 100
Subtract the new number by the original number
3 - 813 = -810
-810 ÷ 813 = -0.996309963099631
-0.996309963099631 x 100 = -99.63%