-81.62% is the change from 816 to 150
Calculation steps:
[( 150 - 816 ) ÷ 816] x 100 = -81.62%
Formula
Percentage change = [(150 - 816) / 816] x 100
Subtract the new number by the original number
150 - 816 = -666
-666 ÷ 816 = -0.8161764705882353
-0.8161764705882353 x 100 = -81.62%