To answer the above question, the relevant sentence is: As of 2016, the tourism industry is estimated to contribute about 10 percent to the Icelandic GDP; the number of foreign visitors is set to exceed 2,000,000 by the end of 2017; tourism is responsible for a share of nearly 30 percent of the country's export revenue.
This justifies what answer for what question? Q & A:
Passage: Tourism in Iceland has grown considerably in economic significance in the past 15 years. As of 2016, the tourism industry is estimated to contribute about 10 percent to the Icelandic GDP; the number of foreign visitors is set to exceed 2,000,000 by the end of 2017; tourism is responsible for a share of nearly 30 percent of the country's export revenue.

Question: Based on this passage, how much impact does the tourist industry have on the icelandic economy?
about 10 percent to the Icelandic GDP ; the number of foreign visitors is set to exceed 2,000,000 by the end of 2017 ; tourism is responsible for a share of nearly 30 percent of the country 's export revenue