<Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Not Rated </Td> <Td> Not Rated </Td> <Td> Not Rated </Td> </Tr> <Tr> <Td> 1997 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Not Rated </Td> </Tr> <Tr> <Td> 1998 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Not Rated </Td> </Tr> <Tr> <Td> 1999 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Not Rated </Td> </Tr>

What's the difference between saturn sl1 and sl 2