Instituted in 1994, it currendy lists nearly 150 vessels that have either violated Norwegian fisheries regulations in waters under Norwegian fisheries jurisdiction or are listed on the IUU lists of regional fisheries management organisations. There is no provision for removing vessels from this list.20 These lists reveal one of the difficulties for fishing inspectorates, in that many of the vessels have sailed under a number of different flags, and may also have changed their name several times. In September 2009, members of the UN Food and Agriculture Organisation agreed a treaty that would, if effectively enforced, improve the effectiveness of this kind of measure by refusing port access to foreign ships that cannot justify the legitimacy of their catch and requiring ships' flag countries to take action against their own vessels subject to such refusal. The actual results of enforcement efforts are mixed - and they are also difficult to analyse because data on overall catches are not fully reliable. Considering the tendency of total allowable catches to be set relatively high, it should be important to ensure that they are not exceeded.