<Tr> <Td> Natarajan Krishnan </Td> <Td> </Td> <Td> April 1981 </Td> <Td> September 1986 </Td> <Td> </Td> </Tr> <Tr> <Td> C.R. Gharekhan </Td> <Td> </Td> <Td> October 1986 </Td> <Td> December 1992 </Td> <Td> </Td> </Tr> <Tr> <Td> Mohammad Hamid Ansari </Td> <Td> </Td> <Td> January 1993 </Td> <Td> January 1995 </Td> <Td> </Td> </Tr> <Tr> <Td> Prakash Shah </Td> <Td> </Td> <Td> February 1995 </Td> <Td> July 1997 </Td> <Td> </Td> </Tr>

Who has served as the ambassador of india to the un