By clicking on the Statistics under Dashboard in the left menu, you will be directed to a page which provides statistical data about your tools and latest visits done on them. This page has three sections. In the first section, some numerical information is provided. more details about each number can be found by hovering on the question marks on their top.
In the second part, there is a chart which shows the unique visits in the past 30 days. By hovering on each point, more details are revealed.