-89.99% is the change from 819 to 82
Calculation steps:
[( 82 - 819 ) ÷ 819] x 100 = -89.99%
Formula
Percentage change = [(82 - 819) / 819] x 100
Subtract the new number by the original number
82 - 819 = -737
-737 ÷ 819 = -0.8998778998778999
-0.8998778998778999 x 100 = -89.99%