The Netherlands is a large net exporter of oil products with a sizeable marine bunker market. BP, ExxonMobil, Shell, Total, Gunvor, and LUKOIL each have an interest in one of the five large oil refineries in the Netherlands, which are ideally located for supplying inland demand, the large marine bunkering and export markets. The incumbent refiners and marketers have sought to gain a relatively large share of the market. Accordingly, the market structure is highly concentrated with the top five players supplying over 60% of the market. The retail sector remains relatively dense compared to other western European countries with high prices due to the level of taxation on fuel. Retail gross margins remain some of the highest across Europe. There has been substantial growth of the unmanned price-discount segment which now represents over 50% of the market. The EG Group has become the Dutch market leader with nearly 600 service stations.