The tourist sector is estimated to contribute over 50 percent of San Marino's GDP. In 1997, San Marino's rich history, charming mountain views, fine dining, and shopping attracted 3.4 million tourists. The republic's proximity to major maritime tourist resorts on the Adriatic Sea at Rimini and and to world centers of sophisticated tourism such as the museum cities of Florence and Venice also stimulated tourism. In finance, apart from the major Italian banks and insurance firms, there is only 1 local credit institution, the Istituto di Credito Sammarinese, which performs the functions of a central bank. Among other duties, this institution coordinates the country's banking system and performs treasury and tax collection services. Given the small size of the retail market, small, family-owned stores prevail. The Sammarinese also shop in larger retail establishments in Italy, however.