-87.09% is the change from 635 to 82
Calculation steps:
[( 82 - 635 ) ÷ 635] x 100 = -87.09%
Formula
Percentage change = [(82 - 635) / 635] x 100
Subtract the new number by the original number
82 - 635 = -553
-553 ÷ 635 = -0.8708661417322835
-0.8708661417322835 x 100 = -87.09%