Which department has a vacancy at the moment? Which graph is correct?

Man: Good morning. Maxton Products.
Woman: Oh, hello. I saw in the paper last week that you’ve got a vacancy for a secretary in your production department.
Man: Well, actually that vacancy was in the personnel department but the position’s filled now. We are looking for a secretary in the sales department, though.
Woman: Thanks, but I’m not really interested...

The price of shares remained steady for the first half of the year but there was a sudden fall in their value in the second half.