Apologies - forgot about the summer seasonal route to the Isle of Man
For the Angelesy - IoM route, CAA passenger statistics in 2012 are:
May - 20 passengers (seasonal route probably starts in May)
Jun - 121 passengers
Jul - 85 passengers
Aug - 67 passengers
As usual, a single person making a round trip counts as 2 passengers. The stats imply on average 21 passengers per week flew this route.