<Table> <Tr> <Th> Reverses of the Lincoln cent </Th> </Tr> <Tr> <Td> Wheat (1909--1958) </Td> </Tr> <Tr> <Td> Lincoln Memorial (1959--2008) </Td> </Tr> <Tr> <Td> Birth and early childhood in Kentucky (Lincoln Bicentennial, 2009) </Td> </Tr> <Tr> <Td> Formative Years in Indiana (Lincoln Bicentennial, 2009) </Td> </Tr> <Tr> <Td> Professional life in Illinois (Lincoln Bicentennial, 2009) </Td> </Tr> <Tr> <Td> Presidency in DC (Lincoln Bicentennial, 2009) </Td> </Tr> <Tr> <Td> Union shield (2010--present) </Td> </Tr> </Table> <Tr> <Th> Reverses of the Lincoln cent </Th> </Tr> <Tr> <Td> Wheat (1909--1958) </Td> </Tr> <Tr> <Td> Lincoln Memorial (1959--2008) </Td> </Tr>

What year did the us mint stop making copper pennies