No. of Emails Received from Internet doesn't include total

No. of Emails Received from Internet doesn't include total

I am trying to run a report to get the total number of emails received from internet sources over a month's period. The "No. of Emails Received From Internet" report wants to show me Top 10 senders, and breakdowns by domain, but no totals. There is already a report for such information (by Domain) so I don't know why this is giving me that info.

Where can I find the total number for the period?