-80.64% is the change from 816 to 158
Calculation steps:
[( 158 - 816 ) ÷ 816] x 100 = -80.64%
Formula
Percentage change = [(158 - 816) / 816] x 100
Subtract the new number by the original number
158 - 816 = -658
-658 ÷ 816 = -0.8063725490196079
-0.8063725490196079 x 100 = -80.64%