#!/usr/local/bin/perl

use strict;
use warnings;
use Data::Dumper;
$Data::Dumper::Indent = 1;

my $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'], 
  } 
}; 

my $key = q{75.34.42.17511726663};
my @sorted_by_year;
for my $year (sort keys %{$hash_value->{$key}}) {
  push @sorted_by_year, {$year => $hash_value->{$key}{$year}};
}

print Dumper \@sorted_by_year;
[download]

$VAR1 = [
  {
    '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'
    ]
  }
];
[download]