-96.7% is the change from 819 to 27
Calculation steps:
[( 27 - 819 ) ÷ 819] x 100 = -96.7%
Formula
Percentage change = [(27 - 819) / 819] x 100
Subtract the new number by the original number
27 - 819 = -792
-792 ÷ 819 = -0.967032967032967
-0.967032967032967 x 100 = -96.7%