I'm afraid that our Stats & Trend reports cannot be modified to show specific weeks in the past. Keep in mind however that Average Listing Price we show on the following page is for the most recent week.
And if you're checking out market trends on this page, you can change the graphs to display information for 1 year or 5 year periods rather than the 10 year periods we show by default.
I will share your request to make this information display more flexible with my colleagues. If you have any other feedback, please don't hesitate to share it with us.