<Table> <Tr> <Th> Year </Th> <Th> School </Th> </Tr> <Tr> <Td> 1940 </Td> <Td> LSU </Td> </Tr> <Tr> <Td> 1942 </Td> <Td> LSU </Td> </Tr> <Tr> <Td> 1947 </Td> <Td> LSU </Td> </Tr> <Tr> <Td> 1955 </Td> <Td> LSU </Td> </Tr> <Tr> <Td> 1968 </Td> <Td> Florida </Td> </Tr> <Tr> <Td> 1973 </Td> <Td> Florida </Td> </Tr> <Tr> <Td> 1993 </Td> <Td> Florida </Td> </Tr> <Tr> <Td> 1999 </Td> <Td> Georgia </Td> </Tr> <Tr> <Td> 2001 </Td> <Td> Florida </Td> </Tr> <Tr> <Td> 2005 </Td> <Td> Georgia </Td> </Tr> <Tr> <Td> 2013 </Td> <Td> Alabama </Td> </Tr> <Tr> <Td> 2014 </Td> <Td> Alabama </Td> </Tr> <Tr> <Td> 2015 </Td> <Td> LSU </Td> </Tr> </Table> <Tr> <Th> Year </Th> <Th> School </Th> </Tr> <Tr> <Td> 1940 </Td> <Td> LSU </Td> </Tr> <Tr> <Td> 1942 </Td> <Td> LSU </Td> </Tr>

How many sec teams have won the national championship in football