Iceland's economy has been diversifying into manufacturing and service industries in the last decade, including software production, biotechnology, and finance; industry accounts for around a quarter of economic activity, while services comprise close to 70%. The tourism sector is expanding, especially in ecotourism and whale-watching. On average, Iceland receives around 1.1 million visitors annually, which is more than three times the native population. 1.7 million people visited Iceland in 2016, 3 times more than the number that came in 2010. Iceland's agriculture industry, accounting for 5.4% of GDP, consists mainly of potatoes, green vegetables (in greenhouses), mutton and dairy products. The financial centre is Borgartún in Reykjavík, which hosts a large number of companies and three investment banks. Iceland's stock market, the Iceland Stock Exchange (ISE), was established in 1985.