-97.37% is the change from 799 to 21
Calculation steps:
[( 21 - 799 ) ÷ 799] x 100 = -97.37%
Formula
Percentage change = [(21 - 799) / 799] x 100
Subtract the new number by the original number
21 - 799 = -778
-778 ÷ 799 = -0.9737171464330413
-0.9737171464330413 x 100 = -97.37%