-87.91% is the change from 678 to 82
Calculation steps:
[( 82 - 678 ) ÷ 678] x 100 = -87.91%
Formula
Percentage change = [(82 - 678) / 678] x 100
Subtract the new number by the original number
82 - 678 = -596
-596 ÷ 678 = -0.8790560471976401
-0.8790560471976401 x 100 = -87.91%