Weekly and Monthly unique mobile visitors

The Mobile section of site catalyst can show you the unique visitors that used a mobile device for a day.  There is no option to see it based of a week or month like you can with regular users.  With many new mobile devices being more powerful and growing in number, this is a sector of the web that could become an important market.  Being able to track the unique users over a longer time frame can help website to better see how much of there audience uses this platform.  This can lead to better decisions about mobile features, apps, and marketing.