-97.53% is the change from 809 to 20
Calculation steps:
[( 20 - 809 ) ÷ 809] x 100 = -97.53%
Formula
Percentage change = [(20 - 809) / 809] x 100
Subtract the new number by the original number
20 - 809 = -789
-789 ÷ 809 = -0.9752781211372065
-0.9752781211372065 x 100 = -97.53%