-97.55% is the change from 817 to 20
Calculation steps:
[( 20 - 817 ) ÷ 817] x 100 = -97.55%
Formula
Percentage change = [(20 - 817) / 817] x 100
Subtract the new number by the original number
20 - 817 = -797
-797 ÷ 817 = -0.9755201958384333
-0.9755201958384333 x 100 = -97.55%