-87.5% is the change from 656 to 82
Calculation steps:
[( 82 - 656 ) ÷ 656] x 100 = -87.5%
Formula
Percentage change = [(82 - 656) / 656] x 100
Subtract the new number by the original number
82 - 656 = -574
-574 ÷ 656 = -0.875
-0.875 x 100 = -87.5%
Example