-81.58% is the change from 809 to 149
Calculation steps:
[( 149 - 809 ) ÷ 809] x 100 = -81.58%
Formula
Percentage change = [(149 - 809) / 809] x 100
Subtract the new number by the original number
149 - 809 = -660
-660 ÷ 809 = -0.8158220024721878
-0.8158220024721878 x 100 = -81.58%