<Tr> <Td> 1988 </Td> <Td> Bill Walsh </Td> <Td> Chicago </Td> <Td> Chicago Bears </Td> <Td> 28--3 </Td> <Td> 13--6 </Td> </Tr> <Tr> <Td> 1989 </Td> <Td> George Seifert </Td> <Td> San Francisco </Td> <Td> Los Angeles Rams </Td> <Td> 30--3 </Td> <Td> 17--2 </Td> </Tr> <Tr> <Td> 1994 </Td> <Td> George Seifert </Td> <Td> San Francisco </Td> <Td> Dallas Cowboys </Td> <Td> 38--28 </Td> <Td> 16--3 </Td> </Tr> <Tr> <Td> 2012 </Td> <Td> Jim Harbaugh </Td> <Td> Atlanta </Td> <Td> Atlanta Falcons </Td> <Td> 28--24 </Td> <Td> 13--4--1 </Td> </Tr>

How many super bowl rings do the 49ers have