-80.68% is the change from 823 to 159
Calculation steps:
[( 159 - 823 ) ÷ 823] x 100 = -80.68%
Formula
Percentage change = [(159 - 823) / 823] x 100
Subtract the new number by the original number
159 - 823 = -664
-664 ÷ 823 = -0.8068043742405833
-0.8068043742405833 x 100 = -80.68%