-98.17% is the change from 819 to 15
Calculation steps:
[( 15 - 819 ) ÷ 819] x 100 = -98.17%
Formula
Percentage change = [(15 - 819) / 819] x 100
Subtract the new number by the original number
15 - 819 = -804
-804 ÷ 819 = -0.9816849816849816
-0.9816849816849816 x 100 = -98.17%