<Tr> <Th> </Th> <Td> 27 </Td> <Td> 15 </Td> <Td> 8 </Td> </Tr> <Tr> <Th> 2011 </Th> <Td> 15 </Td> <Td> 27 </Td> <Td> 8 </Td> </Tr> <Tr> <Th> 2012 </Th> <Td> 15 </Td> <Td> 29 </Td> <Td> 6 </Td> </Tr> <Tr> <Th> 2013 </Th> <Td> 17 </Td> <Td> 28 </Td> <Td> 5 </Td> </Tr>

How many republicans are there in the united states