-98.69% is the change from 688 to 9
Calculation steps:
[( 9 - 688 ) ÷ 688] x 100 = -98.69%
Formula
Percentage change = [(9 - 688) / 688] x 100
Subtract the new number by the original number
9 - 688 = -679
-679 ÷ 688 = -0.9869186046511628
-0.9869186046511628 x 100 = -98.69%