<Tr> <Td> 2009 </Td> <Td> 11,910 </Td> <Td> 383.1 </Td> <Td> 3.22% </Td> </Tr> <Tr> <Td> 2008 </Td> <Td> 10,025 </Td> <Td> 451.2 </Td> <Td> 4.50% </Td> </Tr> <Tr> <Td> 2007 </Td> <Td> 9,008 </Td> <Td> 430.0 </Td> <Td> 4.77% </Td> </Tr> <Tr> <Td> 2006 </Td> <Td> 8,507 </Td> <Td> 405.9 </Td> <Td> 4.77% </Td> </Tr>

Which of the following is true about the national debt of the united states