-96.3% is the change from 811 to 30
Calculation steps:
[( 30 - 811 ) ÷ 811] x 100 = -96.3%
Formula
Percentage change = [(30 - 811) / 811] x 100
Subtract the new number by the original number
30 - 811 = -781
-781 ÷ 811 = -0.9630086313193588
-0.9630086313193588 x 100 = -96.3%