<Tr> <Td> 1970 </Td> <Td> 1971 </Td> <Td> 1972 </Td> <Td> 1973 </Td> <Td> </Td> <Td> </Td> <Td> 1976 </Td> <Td> 1977 </Td> <Td> 1978 </Td> <Td> 1979 </Td> </Tr> <Tr> <Th> 1980s </Th> <Td> <Table> <Tr> <Td> 1980 </Td> <Td> 1981 </Td> <Td> 1982 </Td> <Td> </Td> <Td> 1984 </Td> <Td> 1985 </Td> <Td> 1986 </Td> <Td> </Td> <Td> 1988 </Td> <Td> 1989 </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Td> 1980 </Td> <Td> 1981 </Td> <Td> 1982 </Td> <Td> </Td> <Td> 1984 </Td> <Td> 1985 </Td> <Td> 1986 </Td> <Td> </Td> <Td> 1988 </Td> <Td> 1989 </Td> </Tr> </Table> <Tr> <Td> 1980 </Td> <Td> 1981 </Td> <Td> 1982 </Td> <Td> </Td> <Td> 1984 </Td> <Td> 1985 </Td> <Td> 1986 </Td> <Td> </Td> <Td> 1988 </Td> <Td> 1989 </Td> </Tr>

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