The line graph shows the percent of cars for sale at a used car lot on a given day by model year.
Which of the following statements best describes the overall trend in the percent of cars for sale from model year 2015 to model year 2019?
The percent of cars for sale generally increased.
The percent of cars for sale generally decreased.
The percent of cars for sale remained constant.
The percent of cars for sale fluctuated significantly without a clear direction.
