-99.63% is the change from 811 to 3
Calculation steps:
[( 3 - 811 ) ÷ 811] x 100 = -99.63%
Formula
Percentage change = [(3 - 811) / 811] x 100
Subtract the new number by the original number
3 - 811 = -808
-808 ÷ 811 = -0.9963008631319359
-0.9963008631319359 x 100 = -99.63%