Tourism is also a great contributor for the economy of the city, which is considered one of the top destinations in Europe for city-break tourism and is also the gateway for excursions to the islands or the mainland. Greece attracted 26.5 million visitors in 2015, 30.1 million visitors in 2017 and over 33 million in 2018, making Greece one of the most visited countries in Europe and the world, and contributing 18% to the nation's Gross Domestic Product. Athens welcomed more than 5 million tourists in 2018 and 1,4 million of them were "city-breakers" (in 2013 the city-breakers were only 220.000).