-90.43% is the change from 857 to 82
Calculation steps:
[( 82 - 857 ) ÷ 857] x 100 = -90.43%
Formula
Percentage change = [(82 - 857) / 857] x 100
Subtract the new number by the original number
82 - 857 = -775
-775 ÷ 857 = -0.9043173862310385
-0.9043173862310385 x 100 = -90.43%