Tourism dominates the Croatian service sector and accounts for up to 20% of Croatian GDP. Tourist industry income for 2019 was estimated to be €10.5 billion. Its positive effects are felt through the Croatian economy in terms of increased business volume observed in a retail business, processing industry orders and summer seasonal employment. The industry is an export business because it significantly reduces the country's external trade imbalance. Since the end of the Croatian War of Independence, the tourist industry has rapidly grown, recording a fourfold rise in tourist numbers, with more than 11 million tourists each year. The most numerous are tourists from Germany, Slovenia, Austria, Italy, and Poland as well as Croatia itself.[195] Length of a tourist stay in Croatia averaged 4.7 days in 2019