-80.12% is the change from 820 to 163
Calculation steps:
[( 163 - 820 ) ÷ 820] x 100 = -80.12%
Formula
Percentage change = [(163 - 820) / 820] x 100
Subtract the new number by the original number
163 - 820 = -657
-657 ÷ 820 = -0.801219512195122
-0.801219512195122 x 100 = -80.12%