-90.09% is the change from 686 to 68
Calculation steps:
[( 68 - 686 ) ÷ 686] x 100 = -90.09%
Formula
Percentage change = [(68 - 686) / 686] x 100
Subtract the new number by the original number
68 - 686 = -618
-618 ÷ 686 = -0.9008746355685131
-0.9008746355685131 x 100 = -90.09%