It's working fine (Perl v5.10.1):

#!/usr/bin/perl
use strict;
use warnings;

my %frequency;
while(<DATA>) {
    my @column = split ' ' or next;
    $frequency{$column[2]}++;
}

{
    local($\, $,) = ("\n", "\t");  # tab delimited output
    foreach (sort { $frequency{$b} <=> $frequency{$a} || $a <=> $b } k
+eys %frequency) {
        print $_, $frequency{$_};
    }
}

__DATA__
0.000000e+00           105         35324
1.000000e+00           105         35324
2.000000e+00           105         33308
3.000000e+00           105         35324
4.000000e+00           105         33308
5.000000e+00           105         35324
6.000000e+00           105         33227
7.000000e+00           105         33011
8.000000e+00           105         33227
9.000000e+00           105         35606
1.000000e+01           105         33227
1.100000e+01           105         35537
[download]

To get input from a file, see [Re^2: Alphanumeric sort].