$hash_value = { '75.34.42.17511726663' => { '2005' => [ '11.5', '363,842' ], '1995' => [ '', '200,000' ], '2004' => [ '9.2', '326,345' ], '2001' => [ '6.7', '263,645' ], '1995' => ['','200,000'],'1997' => [ '2.6', '212,118' ], '1998' => [ '3.7', '219,980' ], '2002' => [ '7.6', '283,665' ], '2006' => [ '9.4', '398,148' ], '2000' => [ '7.7', '247,015' ], '1996' => [ '3.3', '206,680' ], '1999' => [ '4.2', '229,281' ], '2003' => [ '5.4', '298,857' ] } }; 

# To sort year from the hash - working properly
@year= sort {$a cmp $b} keys(%{$hash_value->{'75.34.42.17511726663'}});

# To build new structure - year ascending order format. It's not working
$hash_result = {};
foreach $key (@year) {
	$hash_result->{'75.34.42.17511726663'}->{$key} = $hash_value->{'75.34.42.17511726663'}->{$key};
}

Is there anyother method to sort using same hash name?