-86.88% is the change from 686 to 90
Calculation steps:
[( 90 - 686 ) ÷ 686] x 100 = -86.88%
Formula
Percentage change = [(90 - 686) / 686] x 100
Subtract the new number by the original number
90 - 686 = -596
-596 ÷ 686 = -0.8688046647230321
-0.8688046647230321 x 100 = -86.88%