Lets use a fictional example:
John Smith (2500) up 15 / 123 12%
What each data point means (assuming the top section, votes recieved):
The user account for this link is called John Smith (and this links to profile page)
They have 2500rep
They have upvoted the account being examined multiple times
(I've also seen "down", "ApproveEditSuggestion" and "Spam"; and there's probably others).
There are a total of 15 upvotes from this user to the account being examined.
The user has made a total of 127 votes.
Therefore ~12% of this user's upvotes have been for the examined account.
(This last one is only shown if the proportion is "high")
For the lower list (votes cast), it is instead showing votes away from the examined account to the accounts listed. So it shows the total votes for the examined account in column 5, which is why it is uniform in your example, but will vary for spam votes, edit acceptances, etc.