In 2009 31 suspense films were released in the UK. Altogether 503 thriller were released.
Action, animation and comedy account for 52% of the Box-Office I feel they have a large percentage of the market because they have a very large target base.
In 2009 thrillers braught 4% of total uk box office. I think this is unusuallly low as Thrilllers are targeted at a niche audience which are usually males in some cases mature fe-males.