-90.53% is the change from 866 to 82
Calculation steps:
[( 82 - 866 ) ÷ 866] x 100 = -90.53%
Formula
Percentage change = [(82 - 866) / 866] x 100
Subtract the new number by the original number
82 - 866 = -784
-784 ÷ 866 = -0.9053117782909931
-0.9053117782909931 x 100 = -90.53%