<Tr> <Th> Main industries </Th> <Td> Tourism, fish processing, aluminium smelting, ferrosilicon production, geothermal power, hydropower . </Td> </Tr> <Tr> <Th> Ease - of - doing - business rank </Th> <Td> 23rd (2018) </Td> </Tr> <Tr> <Th_colspan="2"> External </Th> </Tr> <Tr> <Th> Exports </Th> <Td> $6.4 billion (April 2017 est .) </Td> </Tr>

What is the most important industry in iceland