First of all, we don't know the year, make, and model of the car you currently have. Secondly, trade-in value is always linked to the condition of the car (poor, fair, good, excellent). Third, where you live is a big factor; the value of cars greatly varies from one region to another. Fourth, are you in the United States? The way cars are purchased here may not be the same way they are purchased where you live.
Once you let us know these things, we are far more likely to be able to give you sound advice.