-81.71% is the change from 809 to 148
Calculation steps:
[( 148 - 809 ) ÷ 809] x 100 = -81.71%
Formula
Percentage change = [(148 - 809) / 809] x 100
Subtract the new number by the original number
148 - 809 = -661
-661 ÷ 809 = -0.8170580964153276
-0.8170580964153276 x 100 = -81.71%