The line graph shows the percent of cars for sale at a used car lot on a given day by model year.

The x-axis represents the model years, and the y-axis represents the percentage of cars for sale.
Which of the following statements best describes the trend in the percent of cars for sale from model year 2012 to model year 2014?
The percentage remained constant.
The percentage decreased steadily.
The percentage increased then decreased.
The percentage decreased then increased.