-96.17% is the change from 810 to 31
Calculation steps:
[( 31 - 810 ) ÷ 810] x 100 = -96.17%
Formula
Percentage change = [(31 - 810) / 810] x 100
Subtract the new number by the original number
31 - 810 = -779
-779 ÷ 810 = -0.9617283950617284
-0.9617283950617284 x 100 = -96.17%