-97.54% is the change from 813 to 20
Calculation steps:
[( 20 - 813 ) ÷ 813] x 100 = -97.54%
Formula
Percentage change = [(20 - 813) / 813] x 100
Subtract the new number by the original number
20 - 813 = -793
-793 ÷ 813 = -0.97539975399754
-0.97539975399754 x 100 = -97.54%