-87.67% is the change from 811 to 100
Calculation steps:
[( 100 - 811 ) ÷ 811] x 100 = -87.67%
Formula
Percentage change = [(100 - 811) / 811] x 100
Subtract the new number by the original number
100 - 811 = -711
-711 ÷ 811 = -0.8766954377311961
-0.8766954377311961 x 100 = -87.67%