<Table> Lord Howe Island <Tr> <Td colspan="2"> Satellite image of the island ; north is up . </Td> </Tr> <Tr> <Td colspan="2"> </Td> </Tr> <Tr> <Th colspan="2"> Geography </Th> </Tr> <Tr> <Th> Location </Th> <Td> Lord Howe Island Group , Tasman Sea </Td> </Tr> <Tr> <Th> Coordinates </Th> <Td> 31 ° 33 ′ 15 '' S 159 ° 05 ′ 06 '' E ﻿ / ﻿ 31.55417 ° S 159.08500 ° E ﻿ / - 31.55417 ; 159.08500 Coordinates : 31 ° 33 ′ 15 '' S 159 ° 05 ′ 06 '' E ﻿ / ﻿ 31.55417 ° S 159.08500 ° E ﻿ / - 31.55417 ; 159.08500 </Td> </Tr> <Tr> <Th> Total islands </Th> <Td> 28 </Td> </Tr> <Tr> <Th> Major islands </Th> <Td> Lord Howe Island , Admiralty Group , Mutton Bird Islands , and Balls Pyramid </Td> </Tr> <Tr> <Th> Area </Th> <Td> 14.55 km ( 5.62 sq mi ) </Td> </Tr> <Tr> <Th> Highest elevation </Th> <Td> 875 m ( 2,871 ft ) </Td> </Tr> <Tr> <Th> Highest point </Th> <Td> Mount Gower </Td> </Tr> <Tr> <Th colspan="2"> Administration </Th> </Tr> <Tr> <Td colspan="2"> Australia </Td> </Tr> <Tr> <Th> Administrative Division </Th> <Td> Unincorporated area of New South Wales Self - governed by the Lord Howe Island Board Part of the electoral district of Port Macquarie Part of the Division of Sydney </Td> </Tr> <Tr> <Th colspan="2"> Demographics </Th> </Tr> <Tr> <Th> Population </Th> <Td> <Ul> <Li> 382 </Li> <Li> Tourists are restricted to 400 at any time . </Li> </Ul> ( 2016 census ) </Td> </Tr> <Tr> <Th> Pop . density </Th> <Td> 26.25 / km ( 67.99 / sq mi ) </Td> </Tr> <Tr> <Th colspan="2"> Additional information </Th> </Tr> <Tr> <Th> Time zone </Th> <Td> <Ul> <Li> UTC + 10 : 30 ( UTC + 10 : 30 ) </Li> </Ul> </Td> </Tr> <Tr> <Th> Summer ( DST ) </Th> <Td> <Ul> <Li> UTC + 11 : 00 ( UTC + 11 ) </Li> </Ul> </Td> </Tr> <Tr> <Td colspan="2"> </Td> </Tr> <Tr> <Th colspan="2"> UNESCO World Heritage Site </Th> </Tr> <Tr> <Th> Official name </Th> <Td> Lord Howe Island Group </Td> </Tr> <Tr> <Th> Type </Th> <Td> Natural </Td> </Tr> <Tr> <Th> Criteria </Th> <Td> vii , x </Td> </Tr> <Tr> <Th> Designated </Th> <Td> 1982 ( 6th session ) </Td> </Tr> <Tr> <Th> Reference no . </Th> <Td> 186 </Td> </Tr> <Tr> <Th> State Party </Th> <Td> Australia </Td> </Tr> <Tr> <Th> Region </Th> <Td> Asia - Pacific </Td> </Tr> <Tr> <Th colspan="2"> </Th> </Tr> <Tr> <Td colspan="2"> </Td> </Tr> </Table>
when did lord howe island became a world heritage site
1982