Services are the most important sector of the economy of the Principality: 86.1% of enterprises and 87.7% of employees. The financial sector plays an important role as an engine of this sector and represents 19.6% of GDP, according to 2017 figures. Tourism is one of the fundamental pillars of the Andorran economy, directly or indirectly responsible for 60% of GDP with approximately 8 million visitors per year. In winter, skiing-related products predominate with 2.51 million ski days sold (timeframe 2017-2018) distributed in more than 3,200 hectares of skiable surface.