The Fairtrade Foundation does not monitor how much extra retailers charge for fair trade goods, so it is rarely possible to determine how much extra is charged or how much reaches the producers, in spite of unfair trading legislation. In four cases it has been possible to find out. One British café chain was passing on less than one percent of the extra charged to the exporting cooperative; in Finland, Valkila, Haaparanta and Niemi found that consumers paid much more for Fairtrade, and that only 11.5% reached the exporter. Kilian, Jones, Pratt and Villalobos talk of US Fairtrade coffee getting $5 per lb extra at retail, of which the exporter would have received only 2%. Mendoza and Bastiaensen calculated that in the UK only 1.6% to 18% of the extra charged for one product line reached the farmer. All these studies assume that the importers paid the full Fairtrade price, which is not necessarily the case.