<Tr> <Th> r% </Th> <Th> </Th> </Tr> <Tr> <Td> 2.1 </Td> <Td> 33.35 </Td> </Tr> <Tr> <Td> 2.2 </Td> <Td> 31.85 </Td> </Tr> <Tr> <Td> 2.3 </Td> <Td> 30.48 </Td> </Tr>

Which area of the world has the longest doubling time