<Tr> <Td> 25 </Td> <Td> Iran </Td> <Td> 7005425326000000000 ♠ 425,326 </Td> </Tr> <Tr> <Td> 26 </Td> <Td> Thailand </Td> <Td> 7005406840000000000 ♠ 406,840 </Td> </Tr> <Tr> <Td> 27 </Td> <Td> Nigeria </Td> <Td> 7005405083000000000 ♠ 405,083 </Td> </Tr> <Tr> <Td> 28 </Td> <Td> Austria </Td> <Td> 7005386428000000000 ♠ 386,428 </Td> </Tr>

What are three countries that are in the bottom 20 of countries for gdp