<Table> <Tr> <Th_colspan="2"> Washington Nationals </Th> </Tr> <Tr> <Td_colspan="2"> 2017 Washington Nationals season </Td> </Tr> <Tr> <Td_colspan="2"> Established in 1969 </Td> </Tr> <Tr> <Td_colspan="2"> Based in Washington, D.C. since 2005 </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Team logo </Td> <Td> Cap insignia </Td> </Tr> </Table> </Td> </Tr> <Tr> <Th_colspan="2"> Major league affiliations </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> National League (1969--present) <Ul> <Li> East Division (1969--present) </Li> </Ul> </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Current uniform </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Retired numbers </Th> <Td> 42 (as Montreal Expos: 8 10 10 30) </Td> </Tr> <Tr> <Th_colspan="2"> Colors </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Red, navy blue, white </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Name </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Washington Nationals (2005--present) </Li> <Li> Montreal Expos (1969--2004) </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Other nicknames </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Nats </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Ballpark </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Nationals Park (2008--present) </Li> <Li> Robert F. Kennedy Memorial Stadium (2005--2007) <Ul> <Li> a.k.a. RFK Stadium </Li> </Ul> </Li> <Li> Olympic Stadium (1977--2004) <Ul> <Li> Hiram Bithorn Stadium (2003--2004) </Li> </Ul> </Li> <Li> Jarry Park Stadium (1969--1976) </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Major league titles </Th> </Tr> <Tr> <Th> World Series titles (0) </Th> <Td> None </Td> </Tr> <Tr> <Th> NL Pennants (0) </Th> <Td> None </Td> </Tr> <Tr> <Th> East Division titles (5) </Th> <Td> <Ul> <Li> 1981 </Li> <Li> 2012 </Li> <Li> 2014 </Li> <Li> 2016 </Li> <Li> 2017 </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Front office </Th> </Tr> <Tr> <Th> Owner (s) </Th> <Td> Ted Lerner </Td> </Tr> <Tr> <Th> Manager </Th> <Td> Dave Martinez </Td> </Tr> <Tr> <Th> General Manager </Th> <Td> Mike Rizzo </Td> </Tr> <Tr> <Th> President of Baseball Operations </Th> <Td> Mike Rizzo </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Washington Nationals </Th> </Tr>

When did the washington nationals become a baseball team