-97.67% is the change from 817 to 19
Calculation steps:
[( 19 - 817 ) ÷ 817] x 100 = -97.67%
Formula
Percentage change = [(19 - 817) / 817] x 100
Subtract the new number by the original number
19 - 817 = -798
-798 ÷ 817 = -0.9767441860465116
-0.9767441860465116 x 100 = -97.67%