How can I track number of 'Enquiry Emails' sent using enquiry form

Real Estate Responsive 5.4

I’m including the integrated ‘Enquiry Form’ in my listings and wanted to know where I can view the number of enquiries a listing has had. This is so I can show future users how successful the site is in attracting the right type of customer e.g. on average, our listings get (example) 6 enquires per week.

I guess there’s an entry somewhere but I don’t know where to look.

Thanks to anyone who can assist.