<Table> Montreal Protocol <Tr> <Th> Signed </Th> <Td> 14--16 September 1987 </Td> </Tr> <Tr> <Th> Location </Th> <Td> Montreal </Td> </Tr> <Tr> <Th> Effective </Th> <Td> 1 January 1989 if 11 states have ratified by then . </Td> </Tr> <Tr> <Th> Condition </Th> <Td> ratification by 20 states </Td> </Tr> <Tr> <Th> Signatories </Th> <Td> 46 </Td> </Tr> <Tr> <Th> Ratifiers </Th> <Td> 197 (all United Nations members, as well as Niue, the Cook Islands, the Holy See and the European Union) </Td> </Tr> <Tr> <Th> Depositary </Th> <Td> Secretary - General of the United Nations </Td> </Tr> <Tr> <Th> Languages </Th> <Td> Arabic, Chinese, English, French, Russian, and Spanish . </Td> </Tr> </Table> <Tr> <Th> Signed </Th> <Td> 14--16 September 1987 </Td> </Tr>

When was the montreal protocol signed and by who
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