-81.38% is the change from 811 to 151
Calculation steps:
[( 151 - 811 ) ÷ 811] x 100 = -81.38%
Formula
Percentage change = [(151 - 811) / 811] x 100
Subtract the new number by the original number
151 - 811 = -660
-660 ÷ 811 = -0.813810110974106
-0.813810110974106 x 100 = -81.38%