Tracking clicked newsletter links by contact group member

I am looking for a way to track clicked links in newsletter emails by members of a contact group. We are using contact groups to link mailing lists from an external system (Microsoft CRM) and are thus making the contact group (as a whole) a subscriber. There is a table Newsletter_SubscriberLink which would seem perfect, but this doesn't seem to track actions of contact group members, only subscribers that have been entered one by one into the newsletter application. The clicks themselves seem to be tracked in Newsletter_Link so these events are obviously being logged, but I don't see how to track the contact group member that did the clicking.