-89.91% is the change from 813 to 82
Calculation steps:
[( 82 - 813 ) ÷ 813] x 100 = -89.91%
Formula
Percentage change = [(82 - 813) / 813] x 100
Subtract the new number by the original number
82 - 813 = -731
-731 ÷ 813 = -0.8991389913899139
-0.8991389913899139 x 100 = -89.91%