-84.19% is the change from 816 to 129
Calculation steps:
[( 129 - 816 ) ÷ 816] x 100 = -84.19%
Formula
Percentage change = [(129 - 816) / 816] x 100
Subtract the new number by the original number
129 - 816 = -687
-687 ÷ 816 = -0.8419117647058824
-0.8419117647058824 x 100 = -84.19%