-80.51% is the change from 816 to 159
Calculation steps:
[( 159 - 816 ) ÷ 816] x 100 = -80.51%
Formula
Percentage change = [(159 - 816) / 816] x 100
Subtract the new number by the original number
159 - 816 = -657
-657 ÷ 816 = -0.8051470588235294
-0.8051470588235294 x 100 = -80.51%