-99.75% is the change from 811 to 2
Calculation steps:
[( 2 - 811 ) ÷ 811] x 100 = -99.75%
Formula
Percentage change = [(2 - 811) / 811] x 100
Subtract the new number by the original number
2 - 811 = -809
-809 ÷ 811 = -0.9975339087546239
-0.9975339087546239 x 100 = -99.75%