There are several reports SuperControl provide in order to track your enquiries:
Enquiry stats
Enquiry date chart
Enquiry sources
Enquiry conversion
Go to Enquiries > Enquiry stats
This gives you a bar graph showing the number of enquiries you have received by month. If you click on a coloured bar, it will give the the number of enquiries for that month.
Go to Enquiries > Enquiry conversion
This report shows the number of enquiries per property. In some instances you will receive one enquiry for multiple properties in which case this report will return higher totals than the enquiry stats report.
You can change the dates by clicking on the calendar icons and then clicking Go.