I am trying to run an SQL query (below) to get a list of all Clicks for all Jobs that were started this year, but I'm having some difficulty querying the Email Address associated with each click. _Subscribers.EmailAddress seems to be blank for every single record in the _Subscribers Data View and I'm not sure if this is expected behaviour and I am supposed to acquire a Subscriber's email using another method, but any help would be greatly appreciated.
SELECT
c.SubscriberKey
,c.URL
,CAST(c.EventDate AS smalldatetime) ClickTime
,s.EmailAddress EmailAddress
,c.JobID
FROM
_click as c LEFT JOIN
_subscribers as s
ON c.SubscriberID = s.SubscriberID LEFT JOIN
_job j
ON j.JobID = c.JobID
WHERE
j.CreatedDate > '2018-01-01'