-96.34% is the change from 819 to 30
Calculation steps:
[( 30 - 819 ) ÷ 819] x 100 = -96.34%
Formula
Percentage change = [(30 - 819) / 819] x 100
Subtract the new number by the original number
30 - 819 = -789
-789 ÷ 819 = -0.9633699633699634
-0.9633699633699634 x 100 = -96.34%