<Tr> <Td> 1990 </Td> <Td> Ron Chernow </Td> <Td> The House of Morgan: An American Banking Dynasty and the Rise of Modern Finance </Td> </Tr> <Tr> <Td> 1991 </Td> <Td> Orlando Patterson </Td> <Td> Freedom, Vol. 1: Freedom in the Making of Western Culture </Td> </Tr> <Tr> <Td> 1992 </Td> <Td> Paul Monette </Td> <Td> Becoming a Man: Half a Life Story </Td> </Tr> <Tr> <Td> 1993 </Td> <Td> Gore Vidal </Td> <Td> United States: Essays 1952 - 1992 </Td> </Tr>

When are the national book award winners announced