<Tr> <Td> 1940s </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 1950s </Td> <Td> 10 </Td> <Td> 7 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 1960s </Td> <Td> 10 </Td> <Td> 5 </Td> <Td> 5 </Td> <Td> </Td> </Tr> <Tr> <Td> 1970s </Td> <Td> 10 </Td> <Td> 5 </Td> <Td> 5 </Td> <Td> </Td> </Tr>

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