Since service industries comprise about two-thirds of Gross Domestic Product (GDP) and agriculture accounts for less than 5%, the structure of the Croatian economy is similar to that of the countries of the European Union. The main economic branches in the country are determined by natural resources, but also by technology and industry (shipbuilding, construction, petrochemicals, the food industry). The most important branch of the economy is tourism, with 20 million foreign guests per year, contributing 20% to GDP. As in many European countries, the greatest problem facing the Croatian economy in the current period of crisis is the relatively high level of unemployment. Croatia has a developed infrastructure, and in the last 20 years, 1,000 km of modern highways have been built, which has contributed significantly to linking the countries of the European Union. In fact, Croatia conducts almost two-thirds of foreign trade with these countries, primarily Italy, Germany, Slovenia and Austria, while Bosnia and Herzegovina and Serbia are also important trading partners.