-84.09% is the change from 811 to 129
Calculation steps:
[( 129 - 811 ) ÷ 811] x 100 = -84.09%
Formula
Percentage change = [(129 - 811) / 811] x 100
Subtract the new number by the original number
129 - 811 = -682
-682 ÷ 811 = -0.840937114673243
-0.840937114673243 x 100 = -84.09%