-96.33% is the change from 817 to 30
Calculation steps:
[( 30 - 817 ) ÷ 817] x 100 = -96.33%
Formula
Percentage change = [(30 - 817) / 817] x 100
Subtract the new number by the original number
30 - 817 = -787
-787 ÷ 817 = -0.9632802937576499
-0.9632802937576499 x 100 = -96.33%