-90.36% is the change from 851 to 82
Calculation steps:
[( 82 - 851 ) ÷ 851] x 100 = -90.36%
Formula
Percentage change = [(82 - 851) / 851] x 100
Subtract the new number by the original number
82 - 851 = -769
-769 ÷ 851 = -0.9036427732079906
-0.9036427732079906 x 100 = -90.36%