-60.78% is the change from 816 to 320
Calculation steps:
[( 320 - 816 ) ÷ 816] x 100 = -60.78%
Formula
Percentage change = [(320 - 816) / 816] x 100
Subtract the new number by the original number
320 - 816 = -496
-496 ÷ 816 = -0.6078431372549019
-0.6078431372549019 x 100 = -60.78%