<Tr> <Td> </Td> <Td> 1980 </Td> <Td> 2008 </Td> <Td> 2036 </Td> <Td> 2064 </Td> <Td> 2092 </Td> <Td> 2104 </Td> <Td> May 26 </Td> </Tr> <Tr> <Td> </Td> <Td> 1981 </Td> <Td> 2009 </Td> <Td> 2037 </Td> <Td> 2065 </Td> <Td> 2093 </Td> <Td> 2105 </Td> <Td> May 25 </Td> </Tr> <Tr> <Td> </Td> <Td> 1982 </Td> <Td> </Td> <Td> 2038 </Td> <Td> 2066 </Td> <Td> 2094 </Td> <Td> 2106 </Td> <Td> May 31 </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> 2011 </Td> <Td> 2039 </Td> <Td> 2067 </Td> <Td> 2095 </Td> <Td> 2107 </Td> <Td> May 30 </Td> </Tr>

When did day of the dead start being celebrated