<Tr> <Td> 1950--51 </Td> <Th> Paul Arizin * </Th> <Td> Forward / Guard </Td> <Td> United States </Td> <Td> Philadelphia Warriors </Td> <Td> </Td> <Td> 1950 </Td> </Tr> <Tr> <Td> 1951--52 </Td> <Th> Bill Tosheff </Th> <Td> Guard </Td> <Td> United States </Td> <Td> Indianapolis Olympians </Td> <Td> 32 </Td> <Td> 1951 </Td> </Tr> <Tr> <Td> 1951--52 </Td> <Th> Mel Hutchins </Th> <Td> Forward / Center </Td> <Td> United States </Td> <Td> Milwaukee Hawks </Td> <Td> </Td> <Td> 1951 </Td> </Tr>

When is nba rookie of the year decided