-97.48% is the change from 833 to 21
Calculation steps:
[( 21 - 833 ) ÷ 833] x 100 = -97.48%
Formula
Percentage change = [(21 - 833) / 833] x 100
Subtract the new number by the original number
21 - 833 = -812
-812 ÷ 833 = -0.9747899159663865
-0.9747899159663865 x 100 = -97.48%