Chart A

Since about 2006, the total sales is the higest in Houston while that is the lowest in Collin County and San Antonio all the time.

Chart B

The sales in Houston is obviously higher than other city and the second place.

Chart C

Although the sales is low in Collin County, the price is highest among those cities and the mean price is just under 300K. By contracst, the price is lowest in Paris at 109K.