-80.12% is the change from 810 to 161
Calculation steps:
[( 161 - 810 ) ÷ 810] x 100 = -80.12%
Formula
Percentage change = [(161 - 810) / 810] x 100
Subtract the new number by the original number
161 - 810 = -649
-649 ÷ 810 = -0.8012345679012346
-0.8012345679012346 x 100 = -80.12%