<Table> <Tr> <Th> Region </Th> <Th> 2013 </Th> <Th> 2014 </Th> <Th> 2015 </Th> <Th>% </Th> </Tr> <Tr> <Td> Americas </Td> <Td> 396,605 </Td> <Td> 398,069 </Td> <Td> 438,435 </Td> <Td> 10.1% </Td> </Tr> <Tr> <Td> Asia </Td> <Td> 400,548 </Td> <Td> 430,508 </Td> <Td> 419,297 </Td> <Td> 2.6% </Td> </Tr> <Tr> <Td> Africa </Td> <Td> 98,304 </Td> <Td> 98,413 </Td> <Td> 101,415 </Td> <Td> 3.1% </Td> </Tr> <Tr> <Td> Europe </Td> <Td> 86,556 </Td> <Td> 83,266 </Td> <Td> 85,803 </Td> <Td> 3.0% </Td> </Tr> <Tr> <Td> Australia and Oceania </Td> <Td> 5,277 </Td> <Td> 5,122 </Td> <Td> 5,404 </Td> <Td> 5.5% </Td> </Tr> <Tr> <Td> Unknown </Td> <Td> 3,263 </Td> <Td> 1,150 </Td> <Td> 677 </Td> <Td> 41.1% </Td> </Tr> <Tr> <Td> Total </Td> <Td> 990,553 </Td> <Td> 1,016,518 </Td> <Td> 1,051,031 </Td> <Td> 3.4% </Td> </Tr> </Table> <Tr> <Th> Region </Th> <Th> 2013 </Th> <Th> 2014 </Th> <Th> 2015 </Th> <Th>% </Th> </Tr> <Tr> <Td> Americas </Td> <Td> 396,605 </Td> <Td> 398,069 </Td> <Td> 438,435 </Td> <Td> 10.1% </Td> </Tr> <Tr> <Td> Asia </Td> <Td> 400,548 </Td> <Td> 430,508 </Td> <Td> 419,297 </Td> <Td> 2.6% </Td> </Tr>

Where do the largest number of immigrants come from