<Tr> <Td> 186 </Td> <Td> Observation towers (302 in West - Berlin) </Td> </Tr> <Tr> <Td> 31 </Td> <Td> Implementing agencies </Td> </Tr> <Tr> <Td> 259 </Td> <Td> Dog runs </Td> </Tr> <Tr> <Td> 20 </Td> <Td> Bunker </Td> </Tr>

Who was the president when the berlin wall came down