-97.6% is the change from 833 to 20
Calculation steps:
[( 20 - 833 ) ÷ 833] x 100 = -97.6%
Formula
Percentage change = [(20 - 833) / 833] x 100
Subtract the new number by the original number
20 - 833 = -813
-813 ÷ 833 = -0.9759903961584634
-0.9759903961584634 x 100 = -97.6%