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

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

# To do stuff with structure - year ascending order format.
my @foo_stuff;
foreach $key (@year) {
    push @foo_stuff, Foo( $hash_value->{'75.34.42.17511726663'}{$key} );
}


sub Foo {
    return @$_[0];
}