-97.55% is the change from 816 to 20
Calculation steps:
[( 20 - 816 ) ÷ 816] x 100 = -97.55%
Formula
Percentage change = [(20 - 816) / 816] x 100
Subtract the new number by the original number
20 - 816 = -796
-796 ÷ 816 = -0.9754901960784313
-0.9754901960784313 x 100 = -97.55%