<Tr> <Td> Kazakhstan </Td> <Td> KNF </Td> <Td> Kazakhstan National Fund </Td> <Td> 7001647000000000000 ♠ 64.7 </Td> <Td> 2000 </Td> <Td> Oil </Td> </Tr> <Tr> <Td> Kazakhstan </Td> <Td> S-K JSC </Td> <Td> Samruk - Kazyna JSC </Td> <Td> 7001609000000000000 ♠ 60.9 </Td> <Td> 2008 </Td> <Td> Non-commodity </Td> </Tr> <Tr> <Td> United States of America Alaska </Td> <Td> APF </Td> <Td> Alaska Permanent Fund </Td> <Td> 7001649000000000000 ♠ 64.9 </Td> <Td> 1976 </Td> <Td> Oil </Td> </Tr> <Tr> <Td> Brunei </Td> <Td> BIA </Td> <Td> Brunei Investment Agency </Td> <Td> 7001400000000000000 ♠ 40 </Td> <Td> </Td> <Td> Oil </Td> </Tr>

What is the purpose of sovereign wealth fund