Create two exports in MailChimp of subscribed and unsubscribed users who are also members of "Members - Free" and compare with the database, e.g. compare the latter type in MC with subscribed users in the DB.
Numbers from October 19th 2015:
"Members - Free" in MC ~ 87
Unsubscribed from newsletter: ~21 (includes ~6 unsubscribed in DB)
Create two exports in MailChimp of subscribed and unsubscribed users who are also members of "Members - Free" and compare with the database, e.g. compare the latter type in MC with subscribed users in the DB.
Numbers from October 19th 2015:
1) + 2) should add up to 3) but doesn't.