-89.46% is the change from 816 to 86
Calculation steps:
[( 86 - 816 ) ÷ 816] x 100 = -89.46%
Formula
Percentage change = [(86 - 816) / 816] x 100
Subtract the new number by the original number
86 - 816 = -730
-730 ÷ 816 = -0.8946078431372549
-0.8946078431372549 x 100 = -89.46%